Onyx countertops are quite rare. They have a unique and awesome look but you really need to understand where and how onyx is best used as a countertop material. Seldom is the stone used in a horizontal orientation as a countertop. Onyx is a strikingly dramatic stone that comes in pastel colors and swirling patterns. But it scratches easily and quickly looks old and used. Check out these onyx sinks for yet another dramatic use of the stone.
Onyx is translucent . . . light transmits through it. It is often backlit to take advantage of this unique property. It makes a dramatic backsplash material but onyx for countertops can be a mistake.
Onyx Countertops ... how do they hold up?
Onyx is a calcareous stone, formed by dissolving limestone and redeposited as a new kind of stone. In caves, drip water forms onyx as stalactites and stalagmites. It is a soft, brittle stone and should be carefully evaluated for its intended use.
Onyx slabs almost always have a fiberglass mesh material on the back to hold the stone together. This should be an indicator of just how fragile the stone is.
As a countertop, onyx is visually appealing but has some drawbacks. It is calcium based, so it reacts to acids and will etch. It is also very soft and scratches easily. Wine, fruit juice, lemons, and vinegar will all react with onyx and can etch the surface.
Cleaning an onyx countertop requires non-acidic cleaners. See care of onyx countertops for cleaning instructions for all types of natural stone.
You should seal onyx . . . however, the stains that you might see are actually acid etched stains which a sealer cannot protect against.
I have seen interesting applications such as onyx bathroom countertops but onyx kitchen countertops are seldom practical. Consider onyx for all sorts of dramatic design elements, because unlike other stones, light transmits through it and makes for a very cool and interesting appeal.
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