Mineral Information and Data:

Boulangerite
Pb5Sb4S11 [CNMNC approved formula]

Named after the French mining engineer, C. L. Boulanger (1810-1849). Later name from an occurrence near Mullan, Idaho.

IMA status : Valid species (Pre-IMA 1837) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
03.05.02.01  
  (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
  (03.05.02)
  
Nickel-Strunz
(10th edition) :
02.HC.15
  (02) Sulfides
  (02.H) Sulfosalts of SnS Archetype
  (02.HC) With only Pb
  
Crystal system:  
Point group (H-M):
  
  
  

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