Hydromagnesite
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Hydromagnesite is a hydrated magnesium carbonate mineral which generally occurs associated with the weathering products of magnesium containing minerals such as serpentine or brucite. It also sometimes appears in caves, deposited from water that has seeped through magnesium rich rocks.
It is mostly used as a fire retardant.
It has the formula: Mg5(CO3)4(OH)2.4H2O.