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.


Marble, a snowy white or richly colored ornamental stone. Polishing brings out the handsome grain, network of delicate veins, and cloudy hues that give marble its special beauty.

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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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