Mineral Information and Data:

Stalderite
TlCu(Zn,Fe,Hg)2As2S6 [CNMNC approved formula]

Named for Prof. Dr. Hans A. Stalder (1925-) of the Natural History Museum, Berne, Switzerland.

IMA status : Approved Species 1993 ()
CLASSIFICATION 
Dana
(8th edition) :
03.04.11.02  
  (03) Sulfides - Sulfosalts
  (03.04) where z/y > 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.04.11)
  
Nickel-Strunz
(10th edition) :
02.GA.40
  (02) Sulfides
  (02.G) Sulfarsenites, sulfantimonites, sulfbismuthites
  (02.GA) Neso-sulfarsenites, etc. without additional S
  
Crystal system: Tetragonal System
Point group (H-M): 42m (or 4 2m) — scalenohedral
  
  
  

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