Mineral Information and Data:

Dufrenoysite
Pb2As2S5 [CNMNC approved formula]

Named for Ours Pierre Armand Petit Dufrenoy (1792-1857), French mineralogist, National School of Mines, Paris, France.

IMA status : Valid species (Pre-IMA 1845) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
03.05.09.03  
  (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.HC.05d
  (02) Sulfides
  (02.H) Sulfosalts of SnS Archetype
  (02.HC) With only Pb
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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