Mineral Information and Data:

Guanacoite
Cu2Mg3(OH)4(AsO4)2 • 4H2O [CNMNC approved formula]

Named for the locality: Mine dump at the El Guanaco Mine, East Catalina, Chile.

IMA status : Approved Species 2003 ()
CLASSIFICATION 
Dana
(8th edition) :
42.04.01.02  (This Dana# Added)
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.04) where (AB)5 (XO4)2 Zq · x(H2O)
  (42.04.01) Akrochordite Group
  
Nickel-Strunz
(10th edition) :
08.DD.10
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DD) With only medium-sized cations, (OH, etc.):RO4= 2:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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