Onyx is a stunning translucent stone that creates drama when underlit or backlit. It makes a dramatic backsplash or wall feature. Because it is a porous, soft stone, it scratches easily so it better used for lower-traffic areas.
A calcareous stone, onyx is formed when dissolved limestone redeposits and forms new stone. It is a soft stone, which is why most onyx slabs are supported with a mesh backing. Typically, onyx is sealed when used as a countertop.