Mineral Information and Data:

Dervillite
Ag2AsS2 [CNMNC approved formula]

Named for Dr. Henri Derville of Strasbourg University, Strasbourg, France.

IMA status : Approved Species 1941 ()
CLASSIFICATION 
Dana
(8th edition) :
03.07.17.01  
  (03) Sulfides - Sulfosalts
  (03.07) where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.17)
  
Nickel-Strunz
(10th edition) :
02.LA.10
  (02) Sulfides
  (02.L) Unclassified Sulfosalts
  (02.LA) Without essential Pb
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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