Travertine tile is a natural material that has unique features that no other stone can offer. Travertine is a relatively hard stone. The distinctive design of Travertine creates some of the most distinguished floor tiles. The stone is characterized by tiny crevices, pitted holes and veins of contrasting color. Travertine is ideal for commercial and residential use. It can be used for floor tile, kitchen flooring, bathroom wall tile, bathroom floor tile, and it is often used externally.
Marble is a nonfoliated metamorphic rock resulting from the metamorphism of limestone, composed mostly of calcite (a crystalline form of calcium carbonate, CaCO3). It is extensively used for sculpture, as a building material, and in many other applications. The word "marble" is colloquially used to refer to many other stones that are capable of taking a high polish.
Onyx is a cryptocrystalline form of quartz. The colors of its bands range from white to almost every color (save some shades, such as Purple or Blue.) Commonly, specimens of onyx available contain bands of colors of white, tan, and brown. Sardonyx is a variant in which the colored bands are sard (shades of red) rather than black. Pure black Onyx is common, and perhaps the most famous variety, but not as common as Onyx with banded colors.