Mineral Information and Data:

Arsenogorceixite
BaAl3(AsO3OH)AsO4(OH)6 [CNMNC approved formula]

Named for its "arsenic" content and relation to "gorceixite.".

IMA status : Approved Species 1992 (1989-055)
CLASSIFICATION 
Dana
(8th edition) :
41.05.12.04  (This Dana# Added)
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.05) where (A B)2 (XO4) Zq
  (41.05.12) Waylandite 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
Unit cell: a = 7.10(3) c = 17.39(4) Z = 3
Crystal Habit: As rhombohedral crystals, flattened to pseudo-octahedral, showing {1011} and {0001}, to 0.2 mm; in spherulitic aggregates of radiating crystals.
  
Color: Colorless, white, yellow, pale yellow, pale blue
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 4
Measured Density: 3.65 g/cm3
Fracture: Conchoidal
  
Geologic Setting: A rare secondary mineral in the oxidized zone of a hydrothermal polymetallic barite–fluorite deposit (Clara mine, Germany).
Mineral Association: Arsenogoyazite, brochantite, agardite, malachite, barian pharmacosiderite, olivenite, fluorite, barite, “limonite”, quartz (Clara mine, Germany); mimetite, adamite, beudantite, tsumcorite (Michael mine, Germany)
  
Synonyms/varieties: Weilerite

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