Alabandite

sulphide

manganese mineral

Formula: MnS
Sulphide, galena group
Specific gravity: 4.0 to 4.1
Hardness: 3½ to 4
Streak: Green
Colour: Black, tarnishing to brown
Environments

Hydrothermal environments

Alabandite occurs in epithermal polymetallic sulphide veins and especially in low-temperature manganese deposits (HOM). It is an accessory mineral in some enstatite chondrodites (Dana). In hydrothermal veins it is commonly associated with galena, chalcopyrite, sphalerite, pyrite, acanthite, rhodochrosite, calcite, rhodonite and quartz (HOM, R&M 86.6.530-535). At Broken Hill, New South Wales, Australia, alabandite is associated with calcite, baryte, pyrite, chabazite and sulphur. At the Uchacchacua mine, Lima Department, Peru, alabandite is associated with fluorite, proustite and rhodochrosite, and at the Sunnyside mine, San Juan County, Colorado, USA, it is associated with friedelite and alleghanyite (R&M 86.6.530-535).

Common impurities: Fe,Mg,Co

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