Hydromagnesite
Chemical compound
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Hydromagnesite is a hydrated magnesium carbonate mineral with the formula Mg₅(CO₃)₄(OH)₂·4H₂O.
It generally occurs associated with the weathering products of magnesium containing minerals such as serpentine or brucite. Wikipedia
Formula mass: 467.64 g/mol
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal habit: Acicular and as encrustations; pseudo-orthorhombic
Crystal system: Monoclinic
Formula (repeating unit): Mg5(CO3)4(OH)2·4H2O
Mohs scale hardness: 3.5
Optical properties: Biaxial (+)
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