Mineral Information and Data:

Arthurite
CuFe3+2(AsO4)2(OH)2 • 4H2O [CNMNC approved formula]

Named for Sir Arthur Edward Ian Montagu Russell (1878-1964) and Arthur William Gerald Kingsbury (1906-1968) for their contributions to British mineralogy.

IMA status : Approved Species 1964 (IMA1964-002)
CLASSIFICATION 
Dana
(8th edition) :
42.11.18.02  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.11) where (AB)4 (XO4)3 Zq · x(H2O)
  (42.11.18) Whitmoreite Group
  
Nickel-Strunz
(10th edition) :
08.DC.15
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DC) With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 10.09Å, b = 9.62Å, c = 5.55Å β = 92.2°
Crystal Habit: As prismatic to acicular crystals, to 5 mm; usually as spherical aggregates and thin crusts.
  
Color: Apple-green to bluish green; pale olive-green in transmitted light.
Diaphaneity: Transparent to translucent
Luster: Vitreous
Measured Density: 3.29 (calculated) g/cm3
  
Geologic Setting: A rare secondary mineral in the oxidized zone of some copper deposits, formed by alteration of arsenopyrite or enargite.
Mineral Association: Pharmacosiderite, scorodite, conichalcite, chenevixite, chalcophyllite, brochantite, quartz.
  

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