Katoptrite

katoptrite

manganosite

magnetite

garnet

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br Formula: Mn²⁺₁₃Al₄Sb⁵⁺₂O₂₀(SiO₄)₂
Antimonate, manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.56 measured, 4.65 calculated
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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