The chemical composition of dolomite is CaMg(CO3)2, the crystal is a carbonate mineral of the trigonal crystal system. The crystal structure of dolomite is similar to that of calcite. The crystal shape is rhombohedron, the crystal plane is often bent into a saddle shape. The poly-sheet double crystals are common, mostly in block granular aggregates. Pure dolomite is white, sometimes it is gray-green, gray-yellow, pink other colors due to other elements impurities, the glass is shiny. The three groups of rhombohedrons are completely cleavage brittle. Mohs hardness is 3.5-4, specific gravity is 2.8-2.9. Mineral powder reacts slowly in cold dilute hydrochloric acid. Dolomite is a carbonate mineral, including iron dolomite manganese dolomite. Its crystal structure is like calcite, often rhombohedral. Bubbles will slowly appear when exposed to cold dilute hydrochloric acid. Some dolomites emit orange-red light under cathode ray irradiation. Dolomite is the main mineral component of dolomite dolomitic limestone. Ramming material dolomite can be used in building materials, ceramics, glass refractory materials, chemical industry, agriculture, environmental protection, energy saving other fields. It is mainly used as a flux for alkaline refractory materials blast furnace ironmaking; production of calcium magnesium phosphate fertilizer preparation of magnesium sulfate; the production of glass ceramic ingredients.