Mineral Information and Data:

Geminite
Cu2+(AsO3OH) • H2O [CNMNC approved formula]

Named from the Latin gemini, twins, in allusion to the usual character of the crystals.

IMA status : Approved Species 1990 ()
CLASSIFICATION 
Dana
(8th edition) :
40.05.12.01  
  (40) Hydrated Phosphates
  (40.05) with miscellaneous formulae
  (40.05.12)
  
Nickel-Strunz
(10th edition) :
08.CB.30
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CB) With only medium-sized cations, RO4:H2O = 1:1
  
Crystal system:  
Point group (H-M):
  
  
  

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