Mineral Information and Data:

Chalcothallite
(Cu,Fe,Ag)6.3(Tl,K)2SbS4 [CNMNC approved formula]

Named for the composition (Cu, Tl).

IMA status : Approved Species 1967 ()
CLASSIFICATION 
Dana
(8th edition) :
03.02.07.01  
  (03) Sulfides - Sulfosalts
  (03.02) where z/y = 4 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals
  (03.02.07)
  
Nickel-Strunz
(10th edition) :
02.BD.40
  (02) Sulfides
  (02.B) Metal Sulfides, M:S > 1:1 (mainly 2:1)
  (02.BD) With Hg, Tl
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
  
  
  

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