Mineral Information and Data:

Pharmacoalumite
KAl4(AsO4)3(OH)4 • 6.5H2O [CNMNC approved formula]

Named originally as 'Alumopharmacosiderite' in allusion to its composition, containing ALUMinium, and its relationship to Pharmacosiderite. Renamed to Pharmacoalunite in 2010.

IMA status : Renamed IMA Approved; 2010 (IMA1980-002)
CLASSIFICATION 
Dana
(8th edition) :
42.08.01.02  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.08) where (AB)7 (XO4)4 Zq · x(H2O)
  (42.08.01) Pharmacosiderite Group
  
Nickel-Strunz
(10th edition) :
08.DK.10
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DK) With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
  
Crystal system: Cubic System
Point group (H-M): 43m (or 4 3m) — hextetrahedral
Unit cell: a = 7.745 Å
Crystal Habit: Incrustation
  
Color: White
Diaphaneity: Transparent to translucent
Luster: Vitreous
Measured Density: 2.86 g/cm3
Streak: White
  
Geologic Setting: With other oxidized arsenates on a museum specimen.
Mineral Association: Ceruleite, olivenite, schlossmacherite, mansfieldite, quartz
  
Synonyms/varieties: Alumopharmacosiderite
Comments: Name changed from alumopharmacosiderite to pharmacoalumite (2010): Williams P A, Hatert F, Pasero M, Mills S (2010) IMA Commission on new minerals, nomenclature and classification (CNMNC) Newsletter 2.

 

Pharmacoalumite
Chalky Alumopharmacosiderite white spots with ceruleite (light blue) and schlossmacherite (green)
Origin: Emma Luisa Mine, Guanaco, Taltal Province, Chile
Sample size: 3 x 5 cm (left), 2.5 x 3 cm (right)
Photo: Diederik Visser

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