Explanation

A carbonate mineral with a simple island like structure. Iron often replaces magnesium and forms iron magnesite, iron magnesite and other varieties. The calcspar (calcite) structure of the trigonal system. Intact crystal form is rare and often presents as granular or dense block like aggregates. White or light yellow white, dyed brownish red for those containing iron. glass lustre. The cleavage {1011} is complete. Brittle, Mohs hardness 3.5-4.5, insoluble in cold hydrochloric acid, soluble in hot acid. It is mainly formed by replacement of dolomitite or dolomitic limestone and magnesium rich rock with magnesium bearing hot water solution, and is often associated with caldte, dolomite, chlorite, talc, etc. Dashiqiao magnesite deposit in Liaoning, China is a world famous large deposit. It is mainly used for making basic refractory bricks, steelmaking furnace lining, cement, and building materials such as heat preservation and heat insulation; It is also a raw mineral material for extracting magnesium, preparing magnesium sulfate and other magnesium compounds.

Classification