A typical mineral that forms rocks is dolomite. Its chemical formula is CaMg (CO3)2, which indicates that it is a calcium magnesium carbonate. It is the main constituent of the metamorphic rock known as dolomitic marble as well as the sedimentary rock known as dolostone. Dolomitic limestone is a type of limestone that contains some dolomite. Chemical Specifications: - MgO: 20-23% - CaCO3: 56 % - Fe2O3: 0.02-0.05% - Whiteness >90 Size 100mesh,20-40mesh,1-3mm,3-5mm,1-3cm,5-8MM