The mineral dolomite is usually found in sedimentary rock deposits called dolomite. There are two types of materials commonly referred to as dolomite: dolomite limestone, which is an irregular mixture of true calcium carbonate and magnesium carbonate, with the chemical formula CaMg (CO3) 2 and calcium carbonate and magnesium carbonate. Dolomite is believed to be formed by replacing some of the calcium in calcium carbonate limestone with magnesium. Dolomite contains calcium and magnesium ions.
Dolomite is composed of a layer of calcium, a layer of carbonate, a layer of magnesium and a layer of carbonate. Dolomite is harder and denser than calcium carbonate and limestone calcite.