Langbanite

Långbanite Locality: Langban, Filipstad, Varmland, Sweden Source: William W Pinch Owner: RRUFF

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

Photos :

Origin: Manggruvan near Långban, Värmland, Sweden Sample size: 3.5 x 4 cm Photo courtesy of: Diederik Visser
Langbanite Comments:  Stout black langbanite crystal in white matrix. Location:  Langban, Varmland, Sweden. Copyright: © Jeff Weissman / Photographic Guide to Mineral Species
Långbanite Locality: Langban, Filipstad, Varmland, Sweden Source: William W Pinch Owner: RRUFF
Origin: Långban mine, Bergslagen ore distr., Filipstad, Värmland, Sweden (type locality) Sample size: 3 x 1.5 x 1.5 cm (top), 3.8 x 2.3 x 2.5 cm (2nd row), 3 x 2 x 2 cm (bottom) Photo courtesy of: Tom Loomis
Långban, Filipstad, Värmland, Sweden © Christopher O’Neill
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