Mineral Information and Data:

Crookesite
Cu7TlSe4 [CNMNC approved formula]

Named after Sir William Crookes (1832-1919), who discovered thallium.

IMA status : Valid species (Pre-IMA 1866) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.04.12.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.04) where Am Bn Xp, with (m+n):p=2:1
  (02.04.12)
  
Nickel-Strunz
(10th edition) :
02.BD.50
  (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 — disphenoidal
  
  
  

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