Mineral Information and Data:

Arsenolite
As2O3 [CNMNC approved formula]

Named for ARSENic in the composition.

IMA status : Valid species (Pre-IMA 1854) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
04.03.09.01  
  (04) Simple Oxides
  (04.03) with a cation charge of 3+ (A+++2 O3)
  (04.03.09)
  
Nickel-Strunz
(10th edition) :
04.CB.50
  (04) Oxides and Hydroxides
  (04.C) Metal:Oxygen = 2:3, 3:5, and Similar
  (04.CB) With medium-sized cations
  
Crystal system: Cubic System
Point group (H-M): m3m (or 4/m 3 2/m) — hexoctahedral
Unit cell: a = 11.074Å
Crystal Habit: Commonly as tiny octahedra, sometimes modified by the dodecahedron, in aggregates or crusts; botryoidal, stalactitic, earthy to pulverulent.
  
Color: White, pale blue, pink to pale yellow if impure with realgar or orpiment; colorless in transmitted light
Diaphaneity: Transparent
Luster: Vitreous to silky
Hardness (Mohs): 1.5
Measured Density: 3.87 g/cm3
Cleavage: On {111}
Fracture: Conchoidal
Streak: White to pale yellowish white.
  
Geologic Setting: An oxidation product of other arsenic-bearing sulfides in hydrothermal veins; may be formed in mine fires or in burning coal seams.
Mineral Association: Claudetite, realgar, orpiment, erythrite
  
Comments: Taste astringent, sweetish; a very toxic substance.

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