Onyx is an artistic natural stone. Onyx is made of calcite, which is the same mineral that makes limestone, marble, and travertine. When water drips from stalactites and stalagmites within these caves and evaporates a compound called calcium carbonate is left behind. This causes the stone’s colorful veins, swirls, and patterns that are unique to onyx. The stone's distinct color attrib... https://www.quora.com/unanswered/Why-Choose-Onyx-Tiles-for-Flooring-from-Buy-Tiles-And-More