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
- 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
- Optical Properties
- Optical Class: Biaxial (–)
- α = 1.737
- β = 1.761
- γ = 1.771–1.778
- 2V(meas.) = n.d.
- Estimated Properties
||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 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.
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