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Formula: Mn2+7Sb5+As5+O12
Antimonate
Crystal System: Orthorhombic
Specific gravity: 4.949 measured, 5.00 calculated
Streak: Brown
Colour: Black, dark reddish brown in transmitted light
Solubility: Totally soluble in hydrochloric acid; partially soluble in nitric acid
Environments:
Metamorphic environments
Hydrothermal environments
Manganostibite is a peculiar compound known only from Långban, Filipstad, Värmland County, Sweden. It occurs in late-stage hydrothermal
veins in manganese deposits in limestone,
associated with
hausmannite, sonolite,
katoptrite, manganoan humite and
garnet
(HOM).
The type locality is the Brattfors Mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden, where manganostibite was found in
skarn bands associated with sonolite and
katoptrite in marble
(AM 55.1489-1499).
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