Mineral Information and Data:

Agardite-(Y)
Cu2+6Y(AsO4)3(OH)6 • 3H2O [CNMNC approved formula]

Named for the composition and for Jules Agard, Geologist, Bureau de Recherches Geologiques et Minieres, Orleans, France.

IMA status : Approved Species 1968 (IMA1968-021)
CLASSIFICATION 
Dana
(8th edition) :
42.05.01.02  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.05) where (A)2 (XO4) Zq · x(H2O)
  (42.05.01) Mixite group (Arsenate Series)
  
Nickel-Strunz
(10th edition) :
08.DL.15
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DL) With large and medium-sized cations, (OH, etc.):RO4 = 2:1
  
Crystal system: Hexagonal System
Point group (H-M): 6/m — dipyramidal
Unit cell: a = 13.583 Å, c = 5.895 Å
Crystal Habit: Crystals acicular in spherical to rosette-like aggregates to 3 mm
  
Color: Blue-green to yellow-green.
Diaphaneity: Semitransparent.
Hardness (Mohs): 3 to 4
Measured Density: 3.61–3.72 g/cm3
Streak: Greenish white
  
Geologic Setting: In the oxidation zone of some copper deposits.
Mineral Association: Azurite, malachite, chrysocolla, cuprite, copper, mimetite, quartz
  

 

Agardite-(Y)
Agardite-(Y)
Origin: Granite Gap, Hidalgo Co., New Mexico, U.S.A.
Sample size: 2 x 1.5 x 1 cm
Photo: Tom Loomis

 

Agardite-(Y)
(zoom-in of above)

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