Mineral Information and Data:

Alarsite
AlAsO4 [CNMNC approved formula]

Named from its chemical composition of Aluminum and Arsenic.

IMA status : Approved Species 1993 (IMA1993-003)
CLASSIFICATION 
Dana
(8th edition) :
38.04.02.02  (This Dana# Added)
  (38) Anhydrous Phosphates, etc
  (38.04) A+ XO4
  (38.04.02) Berlinite Group
  
Nickel-Strunz
(10th edition) :
08.AA.05
  (08) Phosphates, Arsenates, Vanadates
  (08.A) Phosphates, etc. without additional anions, without H2O
  (08.AA) With small cations (some also with larger ones)
  
Crystal system: Trigonal System
Point group (H-M): 32 — trapezoidal
Unit cell: a = 5.031 Å c = 11.226 Å
Crystal Habit: Aggregates, subhedral equant grains to 0.3 mm
  
Color: Colorless, with pale tints of yellow, green, blue due to inclusions; colorless in transmitted light.
Diaphaneity: Semitransparent
Luster: Vitreous
Hardness (Mohs): 4.5 - 5
Measured Density: 3.32 g/cm3
Tenacity: Brittle
Streak: White
  
Geologic Setting: A fumarolic mineral.
Mineral Association: Fedotovite, klyuchevskite, lammerite, nabokoite, atlasovite, langbeinite, hematite, tenorite
  

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