Limestone

Limestone is a sedimentary rock consisting mostly of calcium carbonate and is formed from the remains of ancient sea life such as oysters and mussels that have been compressed over millions of years. It is found in great abundance in many parts of the world, generally in earthy colors such as off-white, gray and beige. 

Granite

Granite is a dense-grained hard stone formed either from the melting of sediments deep within the earth or through magma (lava) activity. The sediments were held under extreme pressure and temperatures for millions of years and then brought to the surface through the upheaval of the crust that formed mountains. 

Slate

Slate is a fine-grained, metamorphic rock, commonly derived from sedimentary rock shale. It's composed mostly of micas, chlorite and quartz and is best suited for floors, walkways, roofing, kitchen countertops and wet bars.

Travertine

Travertine is a variety of limestone that is formed in pools by the precipitation of hot mineral-rich spring water. It's another form of marble that's less dense than high-grade marble and highly porous.