Arsenuranylite - Occurrence, Properties, and Distribution

Chemical Formula – Ca(UO2)4(AsO4)2(OH)4•6(H2O)

Arsenuranylite is an orthorhombic-dipyramidal mineral containing uranium, oxygen, hydrogen, calcium and arsenic. The mineral was first discovered in Russia in 1958. It was named for arsenic and uranium in its composition and its relation to phosphuranylite.

Properties of Arsenuranylite

The following are the key properties of Arsenuranylite:

  • Cell Data
    • Space Group: Bmmb
    • a = 15.40
    • b = 17.40
    • c = 13.768
    • Z = 6
  • Crystal Data
    • Orthorhombic
    • Point Group: 2/m 2/m 2/m.
    • As fine scales and lichenlike incrustations of elongated crystals, to 0.5 mm
    • X-ray Powder Pattern: 7.72 (10), 3.85 (10), 8.41 (8), 3.13 (8), 3.42 (7), 1.778 (7), 1.729 (7)
  • Chemical Composition
    Elements Content 1 Content 2
    UO3 68.64 72.68
    As2O5 16.68 14.6
    H2O 9.15 9.16
    CaO 3.48 3.56
    Total 97.95 100
  • Optical Properties
    • Optical Class: Biaxial (–)
    • α = 1.737
    • β = 1.761
    • γ = 1.771–1.778
    • 2V(meas.) = n.d.
  • Estimated Properties
    Electron density Bulk density (electron density)=3.66 g/cm3
    note: Specific gravity of Arsenuranylite =4.25 g/cm3
    Photoelectric PEArsenuranylite = 1600.54 barns/electron
    U= PEArsenuranylite x ρ Electron density= 5859.62 barns/cm3
    Fermion index Fermion index = 0.004
    Boson index = 0.99
    Radioactivity
    Arsenuranylite is radioactive

How to Identify Arsenuranylite

Arsenuranylite is a yellow- or orange-colored mineral with light yellow streak and translucent appearance. It exhibits scaly structure and perfect cleavage. The average density of arsenuranylite is 4.25 g/cm3, and its hardness is 2.5.

Global Distribution

Arsenuranylite is distributed in the following places:

  • Cherkasar uranium deposit, 30 km northwest of Pap, Chatkal Range, Uzbekistan
  • Menzenschwand, Black Forest. Germany.

Occurrence of Arsenuranylite and Useful Mineral Association

Arsenuranylite occurs in the oxidized zone of a uranium deposit containing arsenic-bearing sulfides. The mineral is closely associated with uranospinite, novacekite, metazeunerite, schoepite and paraschoepite.

References and Further Reading

 

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