magnesite
magnesite Carbonate, MgCO3 and end-member of a solid solution series with siderite, FeCo3; sp. gr. 3.0; hardness 4; whitish; earthy lustre; compact or granular; occurs as an alteration product of serpentines, dolomites, or limestones and may form as a chemical precipitate. It is mined commercially and used in the production of magnesium compounds, refractory products, and special cements.
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magnesite