The Probert Encyclopaedia of Rocks & Minerals

DOLOMITE

Dolomite is a potential ore of magnesium and occurs in widely extended rock masses as dolomitic limestone. It is often intimately mixed with calcite. It is formed from ordinary limestone by the replacement of calcium by magnesium. It has the formulae CaMg(CO3)2 and a relative hardness of 4.
Research Dolomite