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Onyx, a form of marble, is mostly made of calcite and found in caves. Onyx is translucent and can be lit from behind or beneath to showcase its beauty. One slab could contain dozens of different colors, patterns and veining. A stone of exotic and fragile beauty, wild streaks of color may be found on one area of a slab, but nowhere else, much like a contemporary painting.


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  • Gorgeous, breath-taking and
  • Translucency allows for daring design
  • More fragile than other stones because of its calcium carbonate base
  • Comes in shades of greens, dark grays, and browns
  • Often held together by a fiberglass plate at the bottom to strengthen it
  • Like other porous stones, prone to etching, stains and scratches
  • Contemporary and exotic


  • Wipe up spills immediately to prevent damage to countertops.

    • Acidic liquids such as vinegar, wine or fruit juice may leave permanent marks even with attentive cleanup.
  • Seal onyx countertops to help prevent stains, dulling and etching.

    • The sealant should be applied after installation and before use, by a countertop installation professional.
  • Use non-acidic cleaning products to remove dirt and increase shine.

  • Do not spray cleaner directly onto the countertop.

    • Spray onto the dry cloth instead, to prevent the stone from absorbing the cleaner, which could cause permanent damage. Wipe away any excess cleaner immediately.
  • Use a clean dry cloth to clean onyx countertops.

  • Use a cutting board because scratches are usually permanent.

    • Because onyx is translucent, it is harder to hide scratches and stains and they cannot be buffed or polished away.
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