Chemical Formula: (Mn2+,Ca)4(Mn3+,Fe3+)9Sb5+(SiO4)2O16 Locality: At Langbanshyttan, Vermland, Sweden and the Sjo mines near Orebro in Orebro. Name Origin: After its locality.
History
Discovery date : 1877 Town of Origin : MINE LANGBAN, FILIPSTAD, VARMLAND Country of Origin : SUEDE
Optical properties
Optical and misc. Properties : Opaque Refractive Index: from 2,31 to 2,36
Physical Properties
Cleavage: {0001} Good Color: Iron black. Density: 4.91 Diaphaneity: Opaque Hardness: 6.5 – Pyrite Luster: Metallic Streak: grayish black
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