Mineral Information and Data:

Simonite
TlHgAs3S6 [CNMNC approved formula]

Named in 1982 for Simon Engel, son of Peter Engel (b.1942), Swiss crystalographer.

IMA status : Approved Species 1982 ()
CLASSIFICATION 
Dana
(8th edition) :
03.07.10.01  
  (03) Sulfides - Sulfosalts
  (03.07) where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.07.10) Simonite Group
  
Nickel-Strunz
(10th edition) :
02.GC.20
  (02) Sulfides
  (02.G) Sulfarsenites, sulfantimonites, sulfbismuthites
  (02.GC) Poly-sulfarsenites
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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