Dolomite Powder is Limestone Powder with composition of CaCO3 and MgCO3 pertaining to 100% in combination. The proportion of compounds varies with the mining zone. Dolomite Powder is of sedimentary origin. It is believed that the Dolomite Powder was formed due to chemical action of sea-water, which contained high percentage of magnesia, with limestone. Dolomite Powder is a double carbonate of calcium and magnesium.