Katoptrite

minerals

manganosite

magnetite

garnet

Images
Formula: Mn2+13Al4Sb5+2O20(SiO4)2
Antimonate
Specific gravity: 4.56
Hardness: 5½
Streak: Red-brown
Colour: Black; fire-red (in thin sections); red in transmitted light
Common impurities: Fe,Ca,H2O
Environments:

Metamorphic environments

The type locality for katoptrite is the Brattfors Mine, Nordmark Odal Field, Filipstad, Värmland County, Sweden, where it occurs in metamorphosed limestone associated with manganosite, magnetite and garnet (Mindat, HOM, AM 51.1494-1500).

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