Mineral Information and Data:

Arsenogoyazite
SrAl3(AsO4)(AsO3OH)(OH)6 [CNMNC approved formula]

Named for arsenic in the composition and its relationship to goyazite.

IMA status : Approved Species 1984 (IMA1983-043)
CLASSIFICATION 
Dana
(8th edition) :
42.07.04.03  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.07) where (AB)5 (XO4)3 Zq · x(H2O)
  (42.07.04) Arsenocrandallite Group
  
Nickel-Strunz
(10th edition) :
08.BL.10
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BL) With medium-sized and large cations, (OH, etc.):RO4 = 3:1
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Crystal Habit: Crystals indistinctly rhombohedral, may show {0001}, to 30 μm, aggregated into reniform crusts with a radial structure.
  
Color: Pale green to gray-green, white to yellowish
Diaphaneity: Translucent
Luster: Vitreous
Hardness (Mohs): 4
Measured Density: 3.35 g/cm3
Fracture: Conchoidal
  
Geologic Setting: A secondary mineral in a hydrothermal polymetallic barite–fluorite deposit (Clara mine, Germany).
Mineral Association: Olivenite, cornwallite, malachite, brochantite, barian pharmacosiderite, arsenogorceixite, cualstibite, quartz, barite (Clara mine, Germany); arsenocrandallite, beudantite,
olivenite (Centennial Eureka mine, Utah, USA
  

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