Thassos White Marble 18x18 polished natural stone tile with smooth surface, showcasing bright white marble with subtle veining.

Polished Thassos White Marble 18x18 natural stone tile with smooth surface, ideal for elegant flooring or wall applications.

Polished Thassos White Marble tile 18x18 inches, natural stone surface with smooth finish for elegant flooring or wall applications.

Thassos White Marble 18x18 Polished Marble Tile

TWM18X18P0181

SAMPLES SHIP FREE WITHIN 1–3 BUSINESS DAYS

$28.95 / sq. ft.

$65.14 / Piece

QUANTITY

SOLD BY: sq ft Minimum: 50 sq. ft.

Sq. Ft.

pieces

Minimum order: 50 sq. ft.

Add 10% more to cover cuts and waste (recommended)

TOTAL PRICE:

—

Order your full amount plus 10% at once — reorders may vary in tone and veining. Shipping damage is covered with photos; small shortages (1–5 pieces) are refunded, NOT reshipped, so the extra 10% protects you.

Thassos White Marble

Thassos White marble — the purest, most brilliantly white marble in the world. Quarried exclusively on the Greek island of Thassos with crystalline white and virtually no veining. Tile and mosaic formats in polished and honed finishes for luxury bathrooms, spa spaces, and pool interiors. Free sample shipping on all products.

About Thassos White Marble Polished Tile

Material Education

Thassos White is a rare, pure white crystalline marble quarried exclusively from the Greek island of Thassos in the Aegean Sea. Renowned for its exceptional brightness and luminous quality, it displays a near-flawless white field with a brilliant crystalline structure and a reflective, glass-like sheen when polished. Its purity of color is virtually unmatched among natural stones, making it one of the most sought-after marbles in luxury design.

As a genuine natural stone, Thassos White may exhibit subtle variations in crystal density, occasional faint veining, or minor tonal shifts from piece to piece — these are the authentic signatures of natural marble, not imperfections.

About this tile: This 18×18 field tile format delivers large, uninterrupted expanses of brilliant white stone, ideal for flooring and wall cladding applications where maximum visual impact is desired. The generous size minimizes grout lines, allowing the stone's natural luminosity to take center stage.

Design & Inspiration

Thassos White's pure, ice-bright palette pairs beautifully with polished chrome, brushed nickel, warm brass fixtures, and crisp white cabinetry, as well as contrasting elements like Nero Marquina black marble or dark-stained walnut. It suits a wide range of aesthetics — from minimalist contemporary and sleek spa-inspired interiors to classical Mediterranean and transitional luxury spaces.

The 18×18 format laid in a straight-set or offset pattern creates seamless, expansive surfaces that visually enlarge a room and amplify natural light. In bathrooms and spa retreats, the polished surface acts almost like a mirror underfoot, reflecting light and lending an unmistakable sense of opulence.

Popular design combinations: pair large-format Thassos White floor tiles with a contrasting Nero Marquina marble border or mosaic accent strip for a timeless black-and-white luxury look. Explore the full Thassos White collection for coordinating sizes, and browse more marble tile for complementary looks.

Ships in 2–3 Days

Free Sample Shipping

Nationwide Delivery

Premium Natural Stone

Secure Packaging

Thassos White Marble is one of the world's purest and most luminous natural stones, quarried exclusively from the island of Thassos in the Aegean and celebrated for its brilliantly white, crystalline character. This 18×18 polished tile showcases that iconic brightness at a generous scale, making it a premier choice for luxury residential and commercial projects alike.

Each tile is finished to a high polish, enhancing the stone's natural crystalline sparkle and creating a smooth, reflective surface that amplifies light throughout any space. The large 18×18 format allows for minimal grout joints, producing clean, uninterrupted surfaces that feel both expansive and refined.

Ideal for master bathroom floors, shower walls, spa retreats, and elegant foyer installations, these tiles bring a hotel-caliber aesthetic to any setting. Because Thassos White is exceptionally bright and porous, sealing before and after grouting is strongly recommended — ordering a sample first is advised to appreciate the stone's true luminosity in your own lighting conditions.

Material	Natural Marble
Color	Pure White
Type	Field Tile
Tile Size	18 × 18 inches
Finish	Polished
Sold By	Per Sq. Ft.
Application	Floor & Wall (Indoor)
Shade Variation	V2 — Slight Variation
Design	Contemporary / Transitional / Traditional
Country of Origin	Europe

✓ Bathroom FloorLuminous surface amplifies light and space

✓ Shower WallSeamless white backdrop for spa aesthetics

✓ Foyer & EntrywayGrand, impressive first impression underfoot

✓ Feature WallPolished reflectivity elevates accent walls

— Outdoor UsePolished marble not suitable for exterior or frost-exposed areas

— High-Traffic Commercial FloorsPolished surface can scratch and etch; seal and maintain diligently

Free Shipping: This product ships at standard freight rates calculated at checkout based on your location and order size.

Processing & Delivery: Orders are processed within 2–3 business days. Large orders ship via LTL freight — curbside delivery only. An adult must be present to sign for delivery. Estimated transit: 2–10 business days after shipment.

30-Day Returns: Uninstalled tile may be returned within 30 days of delivery. Inspect all tile carefully before installation — installed tile cannot be returned or exchanged. Samples are final sale.

Exclusions: Free shipping does not apply to Hawaii, Alaska, U.S. territories, or international addresses. Additional charges may apply for remote delivery areas.

Sealing: Thassos White is a highly porous, pure white marble that requires diligent sealing to prevent staining. Apply a premium penetrating stone sealer before grouting and again after installation. In wet areas such as showers and bathroom floors, reseal every 6–12 months. Because of its white color, even minor stains can be visible — do not skip or delay sealing.

Cleaning: Clean with a pH-neutral stone cleaner and a soft mop or cloth — never use acidic cleaners (vinegar, lemon-based), bleach, or abrasive scrubbers, as these will etch and dull the polished surface permanently. Wipe up spills, especially acidic liquids like wine, juice, or coffee, immediately. Avoid steam mops on polished marble floors.

Installation: Always use bright white polymer-modified thinset mortar to avoid any gray bleed-through on this pure white stone. Back-butter each tile in addition to applying thinset to the substrate to ensure full coverage and prevent hollow spots. Use non-sanded grout in a matching white tone for joints under 1/8 inch, or sanded grout for wider joints. Allow thinset to cure fully before grouting. Handle tiles with care during installation to avoid chipping the polished edges.

Important: Inspect all tile before installation. Variations in color, veining, and texture between pieces are natural characteristics of genuine stone — not defects. Order 10% overage for cuts, waste, and future repairs. Tile & Mosaic Depot specialists are available M–F 8:30AM–5PM PST at 855-797-8453.

Why Tile & Mosaic Depot

The natural stone specialists

Quarry-Direct Pricing

We buy direct from the source and skip the middleman, so you get showroom-quality stone for less.

Huge Stone Selection

Marble, travertine, limestone, porcelain and more — thousands of tiles, mosaics, and slabs in one place.

Expert Stone Support

Talk to real natural-stone specialists, M–F 8:30AM–5PM PST, at 855-797-8453 or via live chat.

Easy 30-Day Returns

Uninstalled tile can be returned within 30 days. Order with full confidence.

Why Order a Sample
A screen can't show you how Calacatta veining reads under your kitchen lights or how a porcelain finish sits next to your cabinet color. A sample can. It's the single best way to buy stone or porcelain tile with confidence — and the cheapest mistake you'll ever avoid.

How It Works
Samples are $7.99 each. Samples ship free and leave our warehouse within 1–3 business days. Sizes vary by material and availability — typically 3"×3" up to 8"×8" — and every sample is cut from the same material stocked for full orders.

What a Sample Shows
Color, texture, finish, and overall character. Because natural stone varies piece to piece, one sample represents the material but can't show the full range of a lot. Porcelain samples are highly representative of the production run. Want to see the current lot before you commit? Ask us — we'll send photos.

Good to Know

Samples are final sale — non-returnable and non-refundable.
We recommend sampling before every full order, especially for natural stone.
Larger or custom quantity? Contact us for a tailored quote.

Talk to a Specialist
Our stone and tile specialists will help you narrow it down. Call (855) 797-8453 or email sales@tileandmosaicdepot.com, Monday–Friday, 8:30 AM–5 PM PT.

How Your Order Ships
In-stock orders leave our warehouse within 2–3 business days. Stone, porcelain, and mosaic ship on a pallet via scheduled LTL freight and arrive 2–10 business days after dispatch, depending on destination. You'll get tracking and the carrier's name by email the day it ships.

Freight Delivery — What to Expect

The carrier calls you first. Every freight delivery is by appointment. Expect a call or text to set a window before the truck is dispatched.
Curbside delivery. The driver unloads to the curb or driveway. Freight does not include carrying material indoors or into a garage — plan for a helper or a hand truck.
Someone 18+ must sign. Inspect the pallet before signing. Note any damage, shortage, or broken shrink-wrap on the delivery receipt — this is what makes a claim valid.
Truck access. The address must be accessible to a full-size freight truck with enough space to unload.

Free Shipping
Free curbside freight on qualifying mosaic and molding orders over $1,999 in the continental U.S. Field tile, porcelain, and other product types ship at freight rates shown at checkout. Not available to Hawaii, Alaska, U.S. territories, or international addresses.

Damage & Shortages
Report within 3 calendar days of delivery with photos of the pallet, packaging, and affected pieces to sales@tileandmosaicdepot.com. Verified claims are covered. Shortages of 1–5 pieces are refunded rather than reshipped — which is why we recommend ordering 10% overage.

30-Day Returns
Uninstalled tile in full, unopened boxes may be returned within 30 days of delivery. Return freight is paid by the customer. Partial boxes, opened boxes, installed material, and samples are final sale.

Questions Before You Order?
Call (855) 797-8453 or email sales@tileandmosaicdepot.com, Monday–Friday 8:30 AM–5 PM PT. If you're unsure about freight access at your address, ask us before checkout — we'll flag anything that could hold up delivery.

Natural Variation
Quarried stone varies in color, veining, shade, movement, and finish from piece to piece and from lot to lot. Screen photos and samples show the range, not the exact tile you'll receive. Variation is the nature of the material and is never grounds for return. Porcelain is far more consistent, but shade and pattern can still shift between production runs — buy your full quantity in one order.

Before You Install

Order 10% overage. Covers cuts, breakage, and spares for future repairs. Reorders may not match in tone or lot.
Inspect every piece before setting. Pull from all boxes, blend, and dry-lay the full area. Installation is acceptance — no claims are honored once tile is set.
Hire a qualified installer. Natural stone and large-format porcelain require experience with the material. Your installer is responsible for substrate, setting materials, and method.

Sealing & Care
Natural stone should be sealed with a penetrating sealer and re-sealed periodically in wet and high-traffic areas. Clean with a pH-neutral stone cleaner only — vinegar, bleach, ammonia, and acidic cleaners etch marble, limestone, travertine, and onyx permanently. Porcelain does not require sealing. Outdoor stone weathers and shifts in tone over time; this is expected.

Responsibility
Tile & Mosaic Depot supplies material only. We are not responsible for installation, labor costs, substrate conditions, setting materials, product misuse, or damage from handling, sealing, maintenance, or chemicals. No claims, returns, or replacements are accepted on installed material.

California Proposition 65
Some natural stone and porcelain products contain substances known to the State of California to cause cancer or reproductive harm. Details at www.P65Warnings.ca.gov.