Specific gravity: 4.949
Colour: Black, dark reddish brown in transmitted light
Solubility: Totally soluble in hydrochloric acid; partially soluble in nitric acid
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,
katoptrite, manganoan humite and
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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