Polished Marble Bar

1 single marble mosaic tile bar 5.9 inches with polished top surface (sides are unpolished). Multiple bars are pictured to show the natural variation in pattern and color.

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Polished Marble Bar 5.9-Inch is 150 mm x 15 mm x 10mm thick (approximately 5.9 in x 9/16 in x 3/8 in), and only the top surface is polished. The bar can be cut up with a Compound Nipper to make rough “hand-cut” mosaic tiles or used as polished tile to make borders around mosaic designs (sides are NOT polished). The minimum cutting length is roughly 1/2 inch for most stone types, and that means you could get about 10 pieces per bar. (If you try to cut it up shorter than that, some varieties break up into fragments.) For walking surfaces, we recommend using only stone pieces 3/8″ or thicker, but thinner cutting chips could be used for wall murals and other vertical surfaces. Mosaics made from rough chips of broken stone have a more authentic hand-made look.

The bars are sold by the individual piece. Multiple bars are shown in the detail photos only to show the pattern of the stone and how it varies by piece.

Polished Marble Bar 5.9-Inch

Material Clarification

Many varieties of “marble mosaic tile” are not technically marble. Other varieties of stone are used to provide colors not easily available in marble, but all our marble mosaic is undyed natural stone with an unsealed tumble finish.

Expect Product Variation

This product will vary by batch for several reasons, but mainly because it is a natural material that varies as it occurs from quarry to quarry and even within the same quarry. Expect variation in color, pattern, and veining. However, the polished marble bars are fairly consistent in size because they don’t go through a tumbling process. The corners are more consistently sharp for this same reason.

Never Install Tile in Batches

It takes a tremendous amount of energy to cut stone tile. To offer the tile to us at an affordable price, our factory has to be practical and use looser standards of quality control. If consistency is extremely important to you, then make sure you use something other than natural stone. However, you should be aware that all forms of mosaic tile can and frequently do vary by manufacturer batch, and so you should never order your materials in stages or begin installing tile before you have all that you will need. Even the most expensive brands of Italian glass tile comes with warnings to inspect and mix different boxes of their tile before you install it. How much more so this applies to natural stone produced in China!

Product Coverage

Each bar covers approximately 3.5 square inches or 0.02 square feet.


Tile thickness is approximately 3/8 inch, which is thicker than our regular glass mosaic tile. If you are pressing tiles into thinset mortar or concrete, then it would be possible to use these with other types of tile with different thickness, but it might be problematic if you are gluing tile to a flat surface.

Cutting Tile

Our Compound Tile Nipper is recommended for stone and other hard materials. Note that a marble file is also useful for smoothing the edges of cuts and shaping the pieces.

Product Specifications

  • 1 bar of polished natural undyed stone.
  • material varies by batch for color, pattern, and veining.
  • Each tile is 150mm x 15mm x 10mm thick (approximately 5.9 inch x 9/16 inch x 3/8 inch)
  • Coverage: Each bar covers approximately 3.5 square inches or 0.02 square feet.
  • Thickness: 3/8 inch.
  • Recommended for dry locations where water cannot pool.


Unlike tumbled stone, polished stone should be resistant to staining by grout because its pores are sealed with the polish. However, the polished surface is vulnerable to scratching by the sand in the grout, so you should use a little more care and a little less pressure when grouting.

Using Marble Tile for Outdoor Mosaic Art

Most people think that stone is more durable than glass mosaic tile for outdoor mosaic art, but actually the reverse is true for several reasons.


Not all stone is hard, and natural stone only comes in so many colors. To get the range of colors needed to make a mosaic, softer varieties of stone such as honey onyx (actually a calcite) are sometimes all that is available for a particular color. This is especially true when you are talking about affordable types of stone. Sure, emeralds are a rich green, but they are also relatively rare, small and expensive.

Porosity and Freeze Damage

Glass is non-porous, and thus water cannot penetrate into it and then freeze and expand, which causes porous stone to crack and flack away. Keep in mind that the reason we have so many ancient Greek and Roman mosaics left after all the millenia is that the Mediterranean climate is relatively warm and dry. It also helped that many of the ones we now have were buried under volcanic ash for centuries.

Polished stone isn’t quite as vulnerable as tumbled stone because the polish seals the pores, but this protection is literally skin deep. Scratching and age will wear this protection away.

Chemically Vulnerable

Remember that not all marble mosaic tile is technically marble, and even if it were, marble isn’t that hard, and it is also susceptible to chemical damage by naturally occurring substances. For example, the products of decaying organic matter such as rotting leaves are acidic. Marble dissolves in acid. (You can actually listen to mable fizz when you pour vinegar on it.) This is how the acid rain from automobile exhaust in European cities has melted ancient statues. Other varieties of stone are also vulnerable to organic acids and other naturally-occurring substances.

How To Make Marble Mosaics Last

Marble (and the other stone types described as marble) are best used for indoor mosaics where water cannot pool on the surface. However, marble can be used outdoors provided you seal it very well with a tile and grout sealer and check the seal every few years to make sure that water is still beading on the surface instead of soaking in and wetting it. This really isn’t extra work. Even if you used non-porous glass tile, you would still need to seal the mosaic and periodically check the seal because the grout between the tiles is porous and vulnerable to freeze damage.

Outdoor mosaics made from marble should be on vertical surfaces such as walls instead of horizontal surfaces such as the seats of benches or walkways

How To Make Mosaic Art

For more advice on designing your mosaic project or mounting, cutting, and grouting tile, please see our page of Mosaic Frequently Asked Questions or our Mosaic Information Guide, which lists instructional pages described by topic. We also post new articles about making mosaics at our How to Mosaic Blog.

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