Mineral Information and Data:

Cosalite
Pb2Bi2S5 [CNMNC approved formula]

Named after its locality. Bjelkite is named after the Bjelke mine at Nordmark, Vermland, Sweden.

IMA status : Valid species (Pre-IMA 1868) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
03.05.09.01  
  (03) Sulfides - Sulfosalts
  (03.05) where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.05.09) Cosalite Group
  
Nickel-Strunz
(10th edition) :
02.JB.10
  (02) Sulfides
  (02.J) Sulfosalts of PbS Archetype
  (02.JB) Galena derivatives, with Pb
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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