Mineral Information and Data:

Guettardite
Pb(Sb,As)2S4 [CNMNC approved formula]

Named for Jean Etienne Guettard (17-15-1786), French geologist.

IMA status : Approved Species 1967 ()
CLASSIFICATION 
Dana
(8th edition) :
03.07.08.02  
  (03) Sulfides - Sulfosalts
  (03.07) where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.08) Sartorite Group
  
Nickel-Strunz
(10th edition) :
02.HC.05a
  (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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