Mineral Information and Data:

Arsenuranylite  
Ca(UO2)4(AsO4)2(OH)4 • 6H2O [CNMNC approved formula]

Named for ARSENic and URANium in its composition and probable relation to phosphuranylite.

IMA status : Valid species (Pre-IMA 1958) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
42.04.09.01  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.04) where (AB)5 (XO4)2 Zq · x(H2O)
  (42.04.09) Arsenuranylite Group
  
Nickel-Strunz
(10th edition) :
08.EC.10
  (08) Phosphates, Arsenates, Vanadates
  (08.E) Uranyl Phosphates and Arsenates
  (08.EC) UO2:RO4 = 3:2
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 15.4Å, b = 17.4Å, c = 13.77Å
Crystal Habit: As fine scales and lichen-like incrustations of elongated crystals, to 0.5 mm.
  
Color: Deep orange; yellow in transmitted light
Diaphaneity: Semi-transparent
Hardness (Mohs): 2 - 3
Measured Density: 4.25 (calculated) g/cm3
Cleavage: One, perfect
  
Geologic Setting: In the oxidized zone of a uranium deposit containing arsenic-bearing sulfides (Cherkasar deposit, Uzbekistan).
Mineral Association: Paraschoepite, schoepite, metazeunerite, novacekite, uranospinite (Cherkasar deposit, Uzbekistan)
  
Other Properties: Radioactive.

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