Microfine Industries offers Slightly Harder Calcium Magnesium Carbonate. Microfine Industries also offers Calcite, Dolomite, Barytes, Mica and China-Clay. The Slightly Harder Calcium Magnesium Carbonate, also known as Dolomite, is denser. The Slightly Harder Calcium Magnesium Carbonate has specific gravity of 2.85. The Slightly Harder Calcium Magnesium Carbonate has refractive index of 1.58. The Slightly Harder Calcium Magnesium Carbonate has pH value of 9.50. The Slightly Harder Calcium Magnesium Carbonate has moisture content of 0.20 at 1000 Degree C. The Slightly Harder Calcium Magnesium Carbonate has hardness ranging from 3.5 to 4. The Slightly Harder Calcium Magnesium Carbonate has bulk density 1160 gms / litre.