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Ocean Reef Shellstone Slabs Large Format

$2.30

Architectural-Scale Coral-Born Limestone for Statement Installations Across Warm-Climate USA Architecture

Ocean Reef Shellstone Slabs Large Format is the natural-stone specification of choice for projects across the United States that demand both authentic fossiliferous material character and oversized architectural scale — hotel and resort lobbies in destination warm-climate markets, luxury residential entrance halls in coastal Florida and Gulf Coast estates, hospitality and corporate reception areas in flagship commercial properties, museum and cultural-facility floors where the floor itself is part of the architectural composition, and the sheltered exterior architectural settings where polished and honed shellstone bridges the indoor-outdoor transition that defines contemporary warm-climate design.

The large format reads as deliberately architectural at first sight. Each slab anchors a substantial portion of the floor or wall area, allowing the warm pale-cream tone, the visible shell and coral fossil content, and the natural surface variation of Ocean Reef Shellstone to read continuously across the installation rather than as a tiled assembly of smaller pieces. Where smaller shellstone formats can read as residential or domestic, the large-format slab reads as ceremonial — equally appropriate to a grand hotel lobby in a Caribbean resort, a luxury residential entrance hall in coastal Florida, or a sheltered terrace that extends the building’s architectural vocabulary outward into warm-climate landscape.


The Stone and the Reef-Formation Origin

Ocean Reef Shellstone is a fossiliferous limestone — geologically a coquina — formed from the calcified remains of marine organisms compressed and lithified over geological time in ancient reef and shallow-water sediment environments. Citadel Stone sources the material from specific Mediterranean and Middle Eastern deposits selected over decades for fossil richness, colour consistency, and structural integrity at large format. The colour reads as a warm pale cream with subtle variation between pieces, the fossil content varies organically across the supply, and the surface of every slab carries the visible record of its formation — shell cross-sections, coral fragments, sea-life sediments, and the porous structure characteristic of reef-formed stone.

Selection for large-format slab production is meaningfully more demanding than for standard-format products. The oversized slab dimensions require structural integrity across the full slab face, freedom from fracture-prone inclusions, and colour and fossil-content distribution that reads coherently at architectural scale. Every block destined for large-format slab production is inspected at the quarry for slab-grade integrity before processing in our finishing facilities.


The Honed Surface and the Large Format

The standard surface specification for Ocean Reef Shellstone Slabs Large Format is the honed finish — mechanically ground to a smooth, satin-matte surface that reads as architecturally refined without crossing into the high-gloss reflective character of polished stone. The honed surface brings the visible fossil content into clear visual focus across the slab face, preserves the natural surface variation of the stone, and provides a tactile quality that reads as authentically natural rather than mechanically over-processed. For projects preferring the high-gloss reflective character of polished stone at large format, the Ocean Reef Shellstone – Polished Large Format specification in the same family is the appropriate alternative; for projects preferring the textured anti-slip character of brushed stone at exterior scale, the brushed finish in coordinated format is supplied on request.

At the architectural scale of the large-format slab, the honed surface and the substantial slab dimensions combine to produce an installation that reads as a single continuous architectural composition rather than a tiled floor. Grout lines at slab scale are visually subordinate to the slab area, and properly matched grout colour with narrow joints produces a near-continuous surface plane that emphasises the natural-stone material rather than the modular structure of the installation.

Close-up of Ocean Reef Slabs texture and patterns
A detailed close-up showcasing the intricate textures, natural color gradients, and unique patterns of Ocean Reef Slabs by Citadel Stone.

Sealing — Essential and Annual for Exterior and Wet-Area Installations

Sealing is essential for every Ocean Reef Shellstone installation without exception, and the large-format slab specification is no different. The stone is the most porous of the materials in the Citadel Stone catalogue — a direct consequence of its reef-formation origin — and the natural surface contains voids and pores at multiple scales that absorb moisture, atmospheric pollution, and incidental contamination unless protected by a quality penetrating natural stone sealer.

For interior floor installations in dry conditioned environments, initial sealer application is performed within thirty days of installation completion, after grout has fully cured. Reapplication every three to five years under normal residential use is typically sufficient. For commercial interior installations subject to higher-frequency cleaning protocols and heavier foot traffic, the reseal interval moves to every two to three years.

For sheltered exterior installations — covered terraces, loggias, atriums with overhead weather protection, porticos, and similar partially-protected outdoor architecture in warm-climate USA markets — sealing follows the exterior protocol of annual reapplication. This is non-negotiable; the sheltered exterior environment still subjects the porous shellstone to weather exposure that requires the annual sealing schedule for reliable long-term performance.

For wet-area installations — bathroom floors, spa-area installations, water feature walls — annual reapplication is required for the first three years after installation, with the interval extending modestly thereafter under normal use.

Citadel Stone supplies specific sealer recommendations and application guidance with every order. The sealer must be a penetrating natural stone sealer formulated for porous limestone; topical or film-forming sealers are inappropriate. Citadel Stone will not supply this material to customers who have not understood and accepted the sealing protocol, because the long-term performance of the installation depends on it absolutely.


Climate Suitability — Optimized for Warm-Climate USA Markets

Ocean Reef Shellstone is unambiguously warm-climate material and specified accordingly at every format. The optimal United States markets for this large-format slab specification are Florida, the Gulf Coast states (Texas, Louisiana, Alabama, Mississippi), the Carolinas south of the Outer Banks, Southern California, Arizona, Hawaii, and equivalent international destinations across the warm-climate spectrum. In these markets the material performs reliably with the sealing protocol described above, and the visual character aligns with the design vocabulary of coastal, tropical, and subtropical architecture.

Interior installations in cold-climate states perform identically to installations anywhere else — interior environments are climate-controlled and the building’s external climate has no bearing on material performance. Many cold-climate USA projects specify this format and finish for interior luxury work without concern.

Exterior installations in cold-climate states require honest expectation-setting. The combination of high porosity and exposed fossil structure makes Ocean Reef Shellstone more vulnerable to freeze-thaw damage than denser limestones, and exposed exterior installations in cold climates require sealing maintenance discipline that some clients are not prepared to commit to over the long term. For cold-climate exterior specifications, installations should be confined to sheltered exposures, sealing must be maintained annually without lapse, and customers should accept that the surface will require more attention than warm-climate installations. For the most demanding cold-climate exposed exterior work, Citadel basalt is the more weather-resilient choice and is recommended without reservation.

Installation of Ocean Reef Slabs by Citadel Stone
A professional installer laying Ocean Reef Slabs in a modern space, emphasizing the durability and artistic appeal of this natural stone.

Applications

The six application sections below address the architectural settings — both interior and sheltered exterior — where the Ocean Reef Shellstone large-format slab performs at its best. Each reflects the architectural scale of the format and the warm-climate orientation of the material.

Hotel and Resort Lobbies

Hotel and resort lobby flooring is the principal application for which this large-format slab specification was developed. The combination of properties is purpose-suited to the hospitality lobby environment: authentic fossiliferous natural material communicates investment and considered design at first impression, the warm pale-cream tone reads as inviting and luxurious in a way that polished marble and porcelain alternatives cannot match, the visible shell and coral fossil content provides geographic specificity that ties the lobby to its warm-climate setting, the architectural-scale slab format matches the visual scale of grand lobby spaces, and the restorability of natural shellstone provides multi-decade service life with periodic professional refurbishment. Five-star hospitality properties across the warm-climate United States, Caribbean resort markets, Hawaii destination properties, and equivalent international warm-climate destinations specify this format for entrance lobbies, registration areas, and the public-realm flooring that defines the brand experience at arrival. Commercial sealing schedules apply — every two to three years rather than every three to five — with professional cleaning protocols and dedicated maintenance staff using only pH-neutral natural-stone products.

Luxury Residential Entrance Halls and Grand Living Rooms

Luxury residential interior flooring is the second major application for this specification, particularly in coastal Florida estates, Gulf Coast luxury residential, Southern California oceanfront properties, and Hawaii luxury residential where the design vocabulary aligns naturally with the coral-born material identity. Grand entrance halls and foyers where the floor establishes architectural identity from first impression, formal living rooms where the polished or honed slab surface amplifies natural light through tall windows, dining rooms where the architectural scale matches the formality of the room, and the open-plan great rooms that define contemporary luxury warm-climate residential design all use this format. The substantial scale of each slab anchors a meaningful portion of the floor area, allowing the warm pale-cream tone and visible fossil content to read continuously across the room rather than as busy modular grid. Sealing follows the residential interior schedule of every three to five years.

Hospitality and Corporate Reception Architecture

Beyond hotel lobbies specifically, this format serves the broader category of hospitality and corporate reception architecture: restaurant entry environments in luxury hospitality, retail showroom floors in flagship retail properties, corporate reception areas in premium commercial buildings, professional services reception environments where the floor communicates the firm’s positioning, and the public-realm interiors of luxury commercial development. The large-format slab scale reads as appropriately architectural for these reception environments, where the floor is part of the first impression created for visitors and clients. For commercial projects that extend the reception material onto sheltered exterior approach paths, plaza entrances, or covered building forecourts, the same slab format flows naturally across the threshold with the annual exterior sealing schedule applied to the exterior portion.

Sheltered Exterior Architecture and Indoor-Outdoor Continuity

Sheltered exterior installations — covered terraces, loggias, atriums with overhead weather protection, porticos, and the indoor-outdoor transition spaces that define contemporary warm-climate architecture — are particularly appropriate for this format because the sheltered envelope moderates the weather exposure that would compromise the surface in fully exposed conditions. The same slab material flows from interior across the threshold to sheltered exterior, producing single-material continuity that defines luxury warm-climate design. The 24-hour sun, splash from adjacent pool environments, salt-air coastal exposure, and tropical rain that characterise the warm-climate USA markets are all manageable for sheltered installations with the annual sealing schedule maintained. For fully exposed exterior installations — open patios, uncovered terraces, exposed pool decks — the brushed finish in the same Ocean Reef Shellstone family is the appropriate specification, with the honed slabs reserved for sheltered settings where the smoother surface character is appropriate.

Museum, Gallery, and Cultural-Facility Floors

Museum, gallery, and cultural-facility flooring is a specialty application where the architectural neutrality of the warm pale-cream tone supports exhibition display while the substantial slab scale reads as appropriately architectural for the public-realm interior of cultural institutions. Lobby spaces, gallery floors, the connecting corridors of museum architecture, and the public spaces of performing arts and cultural facilities all use this format. Specifications for cultural-facility floors typically include additional requirements around abrasion resistance, acoustic performance, and structured maintenance protocols that are best discussed during the consultation process; Citadel Stone provides facility-specific specification documentation on request.

Statement Bathroom Floors and Spa-Area Installations

While more commonly associated with horizontal flooring at room scale, this large-format slab specification also serves statement master bathroom floor installations in luxury residential work and spa-area installations in luxury hospitality, where the slab scale matches the architectural scale of large master bathroom and spa environments. The warm pale tone, smooth honed surface, and architectural-scale format combine to create bathroom and spa floors that read as spa-quality material refinement at architectural scale. Wet-area sealing protocols apply — annual reapplication for the first three years after installation, with attention to the management of acidic personal-care products that would etch the surface over time. Underfloor heating installations are particularly effective with this combination, producing the silky-warm-underfoot experience that defines luxury bathroom and spa design.

Beautiful Ocean Reef Pavers.
Beautiful Ocean Reef Pavers.

Technical Properties

Property Value Notes
Stone Classification Fossiliferous Limestone (Coquina) Reef-formed sedimentary stone with visible shell and coral fossil content.
Origin Mediterranean & Middle East Hand-quarried from Citadel Stone’s exclusive source deposits.
Surface Treatment Honed (standard); Polished and Brushed available Smooth satin-matte standard finish; alternative finishes on request.
Format Category Large Format Slabs Architectural-scale dimensions for statement installations.
Typical Slab Dimensions 48″ × 24″ to 72″ × 36″ Multiple large formats available; custom dimensions on request.
Standard Thickness 3 cm (1-3/16 in) US standard slab thickness; 2 cm and 4 cm available on request.
Density 2.10 – 2.40 g/cm³ Less dense than non-fossiliferous limestone; consistent with reef-formed stone.
Water Absorption 4.0 – 6.0% High by limestone standards; sealing essential for every installation.
Compressive Strength 25 – 45 N/mm² Suitable for interior flooring, sheltered exterior, and statement architectural surfaces.
Mohs Hardness 3 – 4 Standard limestone hardness; fossil inclusions may show slight variation.
Acid Sensitivity High Sensitive to citric acid, vinegar, wine, and acidic cleaning products.
Frost Resistance Conditional Warm-climate optimal; cold-climate sheltered installations require rigorous annual sealing.
Heat Reflection Excellent Pale colour reflects solar gain in sunlit interior and sheltered exterior settings.
Sealing Requirement Mandatory Annual for exterior and wet-area; every 2–5 years for interior.
Optimum Climate (Interior) Any Performs identically in any USA climate as an interior surface.
Optimum Climate (Sheltered Exterior) Warm, Tropical, Subtropical Cold-climate sheltered installations possible with rigorous sealing.
Fully Exposed Exterior Brushed Finish Recommended Honed surface best confined to sheltered settings; brushed for exposed exterior.

Format Specifications and Coverage Planning

This product is supplied in large-format slab dimensions appropriate to architectural-scale installations. Each slab is substantial — both in face dimension and weight — and requires appropriate handling equipment, two-person or mechanical lifting protocols, and an experienced installation team familiar with large-format natural-stone slab work. Custom dimensions are available on request for bespoke architectural specifications.

Specification Typical Range
Slab Length 48″ – 72″ (120 – 180 cm)
Slab Width 24″ – 36″ (60 – 90 cm)
Standard Thickness 1-3/16 in (3 cm)
Alternative Thicknesses 3/4 in (2 cm) — sheltered interior; 1-9/16 in (4 cm) — heavy loading
Coverage per Slab 8 – 18 sq ft (0.7 – 1.7 sq m) depending on dimensions
Approximate Weight per Slab 70 – 180 lbs depending on dimensions and thickness
Pieces per Pallet 8 – 16 slabs depending on size
Pallet Coverage 80 – 200 sq ft typically
Recommended Cutting Waste Allowance 10 – 20% — large format installations require generous waste allowance
Custom Dimensions Available on request for bespoke architectural projects

Performance Comparison

The comparison below positions Ocean Reef Shellstone Slabs Large Format against the four materials most often considered as alternatives for architectural-scale luxury flooring: honed marble slabs, large-format porcelain slabs, honed granite slabs, and engineered quartz slabs. Travertine is deliberately excluded from this comparison.

Property This Stone Honed Marble Porcelain Slabs Honed Granite Engineered Quartz
Natural Material Yes Yes No (manufactured) Yes No (manufactured)
Visible Fossil Content Yes Rarely No No No
Visual Authenticity True Natural True Natural Engineered Print True Natural Engineered
Visual Warmth Warm Cream Cool/Variable Synthetic Cool/Variable Engineered
Mohs Hardness 3 – 4 3 – 4 7 – 8 6 – 7 7
Water Absorption 4.0 – 6.0% 0.1 – 1.0% <0.5% 0.1 – 0.5% <0.1%
Acid Sensitivity High High None Low None
Sealing Required Mandatory Annual Yes No Recommended No
Restorability Excellent Excellent None Good None
Interior Suitability Excellent Excellent Excellent Excellent Excellent
Sheltered Exterior (Warm) Excellent (sealed) Conditional Excellent Excellent Conditional
Fully Exposed Exterior Brushed Variant Recommended Not Recommended Excellent Excellent Conditional
Heritage Authenticity Centuries Millennia Modern Centuries Modern

Ocean Reef Shellstone Slabs Large Format occupies a distinctive position in the architectural-scale luxury flooring market: it is the only widely-available large-format slab material that combines authentic fossil content with the warm pale tone of coral-born limestone, offering visual identity that no manufactured slab or non-fossiliferous natural stone can replicate. The sealing protocol and acid sensitivity are the genuine trade-offs for the authentic material specification.

Resilient-Ocean-Reef-Pavers
Resilient-Ocean-Reef-Pavers

Installation Considerations

Large-format slab installation is a specialty operation requiring a tile contractor experienced with architectural-scale natural-stone slab work. The substantial weight of each slab (70 to 180 pounds depending on size and thickness) requires appropriate handling equipment — mechanical lifting devices for the larger slabs, two-person lifting protocols at minimum for all slabs, and careful sequencing to avoid damage during placement. Substrate flatness tolerance is more demanding for large-format slabs than for smaller formats — the substrate must be flat within 1/8 inch over a 10-foot run for residential installations and 1/16 inch over 10 feet for commercial work, because any substrate irregularity becomes visible across the large slab face.

Adhesive selection is a high-quality flexible large-format-and-heavy-tile mortar specifically formulated for natural stone and rated for the slab weight, ideally a non-staining white formulation. Standard thinset is not appropriate for this format. Grout joints should be kept narrow (1/8 to 1/4 inch) to maintain visual continuity across the installation, with grout colour matched closely to the warm pale-cream stone tone.

Pre-installation sealing is essential and not optional. A penetrating sealer applied to each slab before installation prevents grout haze and grout colour from absorbing into the porous limestone surface — particularly important at slab scale because grout staining on a large slab is far more visually disruptive than on smaller formats and is difficult or impossible to reverse after the fact.

For sheltered exterior installations, additional installation considerations apply. The substrate must be properly waterproofed and drained, with appropriate falls directing water off the surface rather than allowing it to pool. Expansion joints at appropriate intervals accommodate thermal expansion cycles. Edge details at the building threshold must be properly designed to prevent water tracking back into the interior.


Care and Maintenance

The maintenance of large-format honed shellstone slabs is straightforward but disciplined. Daily care consists of dust-mopping or soft-brush sweeping to remove abrasive grit. Weekly cleaning uses a pH-neutral natural-stone cleaner with a microfibre mop. Acidic cleaners must be avoided absolutely; vinegar, citrus-based products, bleach, and standard household tile cleaners will etch the surface permanently.

Spills should be addressed immediately, particularly wine, fruit juice, coffee, oils, and any acidic substances. The combination of high acid sensitivity and visible large-format surface means that even brief contact with acidic spills can produce visible dull spots that remain after cleaning. Felt pads under furniture legs are essential, heavy furniture must never be dragged across the surface, and entrance mats at all exterior doorways are mandatory for maintaining the finish over time.

For sheltered exterior installations, additional maintenance considerations apply. Annual washdown with clean water and a soft brush removes accumulated atmospheric pollution, pollen, salt-spray residue in coastal settings, and biological growth — typically scheduled before the resealing application each year.

Sealer testing is the foundation of long-term maintenance. The bead test (a droplet of water beading on the surface rather than darkening the stone as it absorbs) confirms the sealer is performing. When the bead test fails, resealing is required promptly. The labour of resealing a large-format slab installation is moderate — typically a full day’s professional work for a substantial installation — and is the difference between an installation that ages beautifully across decades and one that progressively absorbs incidental staining.

Over the lifetime of the installation, the surface may eventually require professional restoration. This is a routine service available from stone-restoration specialists in most US cities and involves re-honing the surface to remove accumulated wear, addressing any deep staining beyond sealer protection, and refinishing to original quality.


Frequently Asked Questions

How does this large-format slab differ from your standard Ocean Reef Shellstone Slabs?

Both products use the same hand-selected Mediterranean and Middle Eastern fossiliferous limestone, but the format scale and the resulting installation character are distinctly different. The standard Ocean Reef Shellstone Slabs listing covers standard slab dimensions typical of residential and small commercial installations. The large format specification covers oversized slab dimensions from 48″ × 24″ up to 72″ × 36″, sized for architectural-scale installations including hotel lobbies, grand residential entrance halls, museum and cultural-facility floors, and the public-realm interiors of luxury commercial development. The large format reads as architectural and ceremonial; the standard slab reads as residential or contemporary commercial. Choose standard for residential and standard commercial work; choose large format for architectural-scale projects where the slab dimension matches the architectural ambition of the space.

How does this differ from your Ocean Reef Shellstone Polished Large Format?

Both products are large-format Ocean Reef Shellstone, but the surface finish differs. The Polished Large Format specification has a high-gloss reflective polished surface that intensifies the warm pale tone, amplifies light across the installation, and reads as more formal and luxurious. This Slabs Large Format specification supplies the honed finish as standard — a smooth satin-matte surface that reads as more architectural and less formal, and that provides better wet-condition performance than polished. Choose polished for traditional luxury hospitality, formal grand residential interiors, and applications where the high-gloss character is part of the design intent. Choose honed slabs for contemporary architectural work, museum and cultural-facility installations, and sheltered exterior applications where the smoother polished surface would be less appropriate. Both finishes are available in the large-format slab specification; the polished version is supplied through the separate Ocean Reef Shellstone Polished Large Format listing.

Can the polished or brushed finish be supplied at this large format?

Yes — while the honed finish is the standard specification for this listing, the same Ocean Reef Shellstone material at large-format slab dimensions can be supplied in the polished or brushed finish on request. The polished large-format specification is more commonly handled through the dedicated Ocean Reef Shellstone Polished Large Format product listing for SEO and catalogue clarity. The brushed finish at large format is supplied on request for projects specifying exterior architectural installations where the brushed anti-slip surface is the appropriate specification. Citadel Stone provides finish-selection consultation as part of the standard consultation process for any large-format slab order.

What is the maximum slab dimension you can supply?

Standard production runs supply slabs up to 72″ × 36″ (180 × 90 cm). For bespoke architectural projects requiring larger dimensions, custom production can supply slabs up to approximately 96″ × 48″ (240 × 120 cm) depending on the structural integrity of the available quarry blocks and the production capacity for the specific project. Custom large-dimension orders typically require eight to sixteen weeks production lead time and dedicated quarry-block selection. Citadel Stone provides custom-dimension consultation as part of the trade support service for architectural specifications requiring oversized slab dimensions.

How does this compare to honed marble slabs for hotel lobby applications?

Both honed shellstone slabs and honed marble slabs are valid specifications for hotel lobby applications, but they deliver different visual outcomes and have different maintenance characteristics. Honed marble offers traditional luxury aesthetic with veining as the primary character — sophisticated, classical, and timeless. Ocean Reef Shellstone offers warm pale-cream tones with visible fossil content — more contemporary, geographically specific to warm-climate markets, and visually distinctive in a way that marble cannot match. Maintenance is similar — both require sealing, both are acid-sensitive, both are restorable. For traditional classical hospitality with established luxury design vocabulary, honed marble may be the more historically appropriate choice. For coastal, tropical, resort, and contemporary luxury hospitality with geographic specificity to warm-climate settings, Ocean Reef Shellstone reads as more design-appropriate and brand-distinctive.

What are the USA delivery lead times for this large format?

Standard large-format slab dimensions are normally available for delivery to most United States destinations within six to ten weeks of order confirmation — longer than smaller-format specifications because of the additional production care required for large-format quarry-block selection, processing, and handling. Custom dimensions, project-specific colour matching, and large commercial orders typically require ten to sixteen weeks from order confirmation to delivery. For trade accounts, hospitality projects, and architectural specifications, dedicated production runs are coordinated through the Citadel Stone trade support team with structured pricing reflecting the architectural-scale specification. Free physical samples are dispatched ahead of full orders on request; for large-format projects, larger sample pieces can be supplied to allow the surface character and fossil content to be assessed at appropriate viewing scale before commitment.


Why Choose Citadel Stone

  • Original source for Ocean Reef Shellstone. Citadel Stone holds the supply relationship with the specific Mediterranean and Middle Eastern deposits from which Ocean Reef Shellstone is sourced. This is not generic shellstone repackaged under a brand name; it is a specific, controlled material with consistent character across batches.
  • Large-format slab specialization. Large-format slab production requires expertise across quarry-block selection, slab cutting, surface finishing, packaging, shipping, and installation guidance that smaller-format production does not. Citadel Stone has supplied large-format slabs to luxury hospitality, museum, and architectural commercial projects across the United States for decades.
  • Family-coordinated stone specification. Ocean Reef Shellstone is available across polished, honed, brushed, sawn, and natural finishes, and across multiple formats including this large-format slab, standard slabs, large-format polished, and standard residential paving formats — supporting whole-project specification with material consistency across surface treatments and format scales within the same stone family.
  • Climate-honest specification guidance. This material is recommended for warm-climate exterior work, interior applications anywhere in the USA, and sheltered exterior applications in any climate with rigorous sealing maintenance. For fully exposed cold-climate exterior work, Citadel basalt is the appropriate recommendation. The advice protects the long-term success of every project.
  • Comprehensive sealing protocol with every order. Specific sealer recommendations, application instructions, the reapplication schedule appropriate to the specific application type, and the bead-test procedure for monitoring sealer effectiveness are supplied with every shipment.
  • Trade support for hospitality, architectural, and luxury residential projects. Dedicated trade account programme for architects, interior designers, hospitality groups, museum and cultural-facility specifiers, and contractors working on architectural-scale projects across the United States.
  • Custom dimensions on request. Beyond the standard large-format range, this specification is available in custom dimensions up to approximately 96″ × 48″ for bespoke architectural requirements, and in alternative thicknesses (2cm sheltered interior, 4cm heavy loading) for project-specific specifications.
  • Restoration referral network. Citadel Stone maintains relationships with stone-restoration specialists across the United States and provides referrals for clients seeking professional restoration of large-format installations after years of service.
  • Nationwide US delivery and worldwide shipping. Coordinated logistics to all fifty states and to international destinations, with secure crating designed specifically for large-format slab protection in transit.
  • Escrow payment protection for new clients. First-time customers receive full payment protection through an escrow arrangement, providing complete financial security on the initial transaction.
  • Five decades of natural stone expertise. Half a century of quarrying, finishing, and delivering premium Middle Eastern stone to projects worldwide — depth of experience that translates into reliable specification advice and consistent product quality at any scale.

Request a Quote or Consultation

Citadel Stone provides a free consultation service for every Ocean Reef Shellstone Slabs Large Format project regardless of scale. The consultation includes review of the project scope and architectural intent, suitability assessment for the specific application setting, slab dimension recommendation based on the architectural composition, substrate and installation requirements review specific to large-format slab work, sealer specification and reapplication schedule appropriate to the application type, coverage and quantity take-off with appropriate waste allowance for large format, and discussion of any project-specific specification considerations. Consultation is available by email, telephone, and video call, and is staffed by experienced natural stone specialists who understand the technical and architectural demands of large-format slab specification.

For architects, interior designers, hospitality groups, museum and cultural-facility specifiers, and contractors working on luxury residential and architectural commercial projects across the United States, Citadel Stone provides dedicated trade support. This includes priority technical advice during specification development, lead-time guarantees on committed orders, custom dimension development for project-specific requirements, presentation sample boards for client meetings, large-format sample pieces shipped to project sites for in-context evaluation, and structured pricing for sustained trade volumes. Trade accounts are opened on request and require a single project reference to activate.

Free physical samples of Ocean Reef Shellstone Slabs are dispatched to specifiers and homeowners alike on request. The fossil content, warm pale-cream tone, and surface character of the honed slab are most accurately understood in physical form rather than from photography — the geological character and visual variation across slabs are difficult to convey through images alone. For large-format projects, larger sample pieces can be supplied to allow the surface character to be assessed at appropriate viewing scale before commitment to the full architectural-scale installation. To request a sample, a quote, or a project consultation, contact Citadel Stone directly using the form on this page or the email address provided.


Product specifications and pricing are subject to change. Contact Citadel Stone for current stock availability and project-specific recommendations.

Citadel Stone’s Ocean Reef Shellstone Slabs Large Format brings the signature coral-born limestone of our Ocean Reef range into the oversized architectural slab specification designed for grand-scale installations across luxury residential, hospitality, and commercial projects in the United States. Each slab is hand-selected from Mediterranean and Middle Eastern reef-formation deposits for fossil content, colour consistency, and structural integrity at large format. The visible record of the stone’s geological origin — shell cross-sections, coral fragments, reef sediment imprints — reads at architectural scale across the installation, becoming part of the visible design narrative rather than a decorative detail. Specified for hotel lobbies in coastal Florida resorts, Caribbean and Hawaii hospitality, luxury residential entrance halls in warm-climate USA markets, museum and gallery floors, hospitality reception architecture, sheltered exterior terraces and loggias, and the indoor-outdoor transition spaces that define contemporary warm-climate design. Sealing is essential and annual for exterior and wet-area installations. This material is optimized for warm, tropical, and subtropical climates. Cold-climate exterior applications are possible with rigorous sealing maintenance but should be limited to sheltered exposures. Citadel basalt is recommended as the more weather-resilient alternative for the most demanding cold-climate exposed exterior work.

Price: $2.30 per sq. ft.

Total: $2.30

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