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Article updated on 6 March 2020 by Kerry Taylor-Smith
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 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:
- Space Group: Bmmb
- a = 15.40
- b = 17.40
- c = 13.768
- Z = 6
- 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)
Content 1: Cherkasar deposit, Uzbekistan; corresponding to Ca1.00(UO2)3.89(AsO4)2.34 • 8.10H2O.
Content 2: Ca(UO2)4(AsO4)2(OH)4 • 6H2O.
- Optical Class: Biaxial (–)
- α = 1.737
- β = 1.761
- γ = 1.771–1.778
- 2V(meas.) = n.d.
||Bulk density (electron density)=3.66 g/cm3
note: Specific gravity of Arsenuranylite =4.25 g/cm3
||PEArsenuranylite = 1600.54 barns/electron
U= PEArsenuranylite x ρ Electron density= 5859.62 barns/cm3
||Fermion index = 0.004
Boson index = 0.99
||Arsenuranylite is radioactive
How to Identify Arsenuranylite
Arsenuranylite is a yellow- or orange-colored mineral with a light yellow streak and translucent appearance. It exhibits a scaly structure - much like fish scales - and perfect cleavage. The average density of arsenuranylite is 4.25 g/cm3, and its hardness is 2.5 on the Mohs scale of mineral hardness.
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