Mineral Information and Data:

Geerite
Cu8.5S5 [CNMNC approved formula]

Named To honor the original collector, Adam Geer, of Utica, New York, USA.

IMA status : Approved Species 1980 ()
CLASSIFICATION 
Dana
(8th edition) :
02.04.07.06  
  (02) Sulfides - Including Selenides and Tellurides
  (02.04) where Am Bn Xp, with (m+n):p=2:1
  (02.04.07) Chalcocite Group ([Cu]2-x S] formulae)
  
Nickel-Strunz
(10th edition) :
02.BA.05c
  (02) Sulfides
  (02.B) Metal Sulfides, M:S > 1:1 (mainly 2:1)
  (02.BA) With Cu, Ag, Au
  
Crystal system:  
Point group (H-M):
  
  
  

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