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Formula: Mn2+4Mn3+9Sb5+O16(SiO4)2
Antimonate, manganese-bearing mineral
Crystal System: Trigonal
Specific gravity: 4.9 measured
Hardness: 6½
Streak: Brown
Colour: Black
Environments:
Långbanite occurs in crystalline limestone and
manganese-rich
skarn in metamorphosed manganese
deposits
(Webmin). Associated minerals include manganese-rich aegirine,
richterite, braunite,
magnetite, hausmannite,
rhodonite and hedyphane
(HOM).
The type locality is Långban, Filipstad, Värmland County, Sweden.
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