minerals

haussmanite

katoptrite

humite

Manganostibite

Images
Formula: Mn2+7Sb5+As5+O12
Antimonate
Specific gravity: 4.949
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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