Mineral Information and Data:

Arhbarite
Cu2MgAsO4(OH)3 [CNMNC approved formula]

Named in 1982 for the locality: Arhbar mine, Bou-Azzer, Morocco.

IMA status : Redefined IMA Approved; 2003 (IMA1981-044)
CLASSIFICATION 
Dana
(8th edition) :
42.06.05.02  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.06) where (AB)2 (XO4) Zq · x(H2O)
  (42.06.05) Strashimirite Group
  
Nickel-Strunz
(10th edition) :
08.BE.25
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BE) With only medium-sized cations, (OH, etc.):RO4 > 2:1
  
Crystal system: Triclinic System
Point group (H-M): 1 — pedial
Unit cell: a = 5.315Å, b = 5.978Å, c = 5.03Å α = 113.58°, β = 97.14°, γ = 89.31°
Crystal Habit: Spherulitic aggregates, fibrous
  
Color: Blue, dark blue
Diaphaneity: Semi-transparent
Luster: Vitreous
Streak: Sky-blue
  
Geologic Setting: A rare secondary mineral in polymetallic hydrothermal ore deposits.
Mineral Association: Dolomite, hematite, lollingite, pharmacolite, erythrite, talc, mcguinnessite (Arhbar mine, Morocco); chrysocolla, brochantite, olivenite, iodargyrite, dolomite (Emma Louisa mine, Chile)
  
Comments: Chemical formula redefined:
Krause W, Bernhardt H J, Effenberger H, Kolitsch U, Lengauer C (2003) Redefinition of arhbarite, Cu2Mg(AsO4)(OH)3, Mineralogical Magazine 67, 1099-1107

 

Arhbarite
Superb blue crystal cluster to 5 mm with several other minerals in large 1.3 cm vug. Also present are spherical masses of lime green conichalcite.
Origin: El Guanaco mine, Taltal, Antofagasta, Chile
Sample size: 5 x 4 x 3 cm
Photo: Tom Loomis

 

Arhbarite
(zoom-in of above)

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