Dolomite, also known as Dolostone and Dolomite Rock, is a common rock-forming mineral. It is a sedimentary rock composed mostly of the mineral dolomite, calcium magnesium carbonate with a chemical composition of CaMg(CO3)2.
Dolomite is found in sedimentary basins around the world. It is possibly formed by the post-physical, chemical and biological processes alteration of lime mud and limestone by magnesium-rich groundwater. Limestone that contains some dolomite is known as dolomitic limestone.