Onyx

Onyx is defined as metamorphic rock.  It originates in the drip stone deposits of limestone caverns, where it forms stalactites, stalagmites, and other formations that can fill an entire cavern.  Onyx is also a chemical sedimentary stone, and may envelop terrestrial fossil remains.   Onyx on the Mohls Scale has a hardness rating between H=4 and H=6.

Onyx is an excellent choice for bathroom vanity tops, walls, tubdecks, and showers.  It may also be used in bar areas, light duty residential floors, sinks, and tables.  Onyx is a very fragile material and great care must be taken to prevent damaging its surface.