Petrology is a discipline of geology that studies rocks, minerals and the processes that act on them. Scientists focus on the formation of rocks in this field of science.



Limestone, a sedimentary rock that occurs in many areas of the world. Limestone consists chiefly of calcite (calcium carbonate), but it usually contains numerous other minerals, including dolomite, flint, alumina, bitumen, and pyrites.

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  • Travertine

    Travertine, a soft, compact or porous form of limestone. It is usually pale yellow, but may be dark yellow, brown, or streaked with light and dark bands because of impurities. See more »

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