Umohoite

Umohoite is a rare oxide and hydroxide mineral. The name of this mineral reflects its composition: uranyl (U), molybdate (Mo) and water (H2O). Its chemical formula is (UO2)MoO4·2H2O.[3]

Umohoite
General
CategoryOxide and Hydroxide
Formula
(repeating unit)
(UO2)MoO4·2H2O
IMA symbolUmo[1]
Crystal systemTriclinic
Identification
ColorBlack, blue-black, dark green, orange-red [2]
CleavagePerfect on {001}
Mohs scale hardness2
LusterVitreous
StreakBlue gray
DiaphaneityOpaque
Density4.53 - 4.66 g/cm3 (Measured) 4.49(3) g/cm3 (Calculated)
Refractive indexnα = 1.660 nβ = 1.831 nγ = 1.915
2V angleMeasured: 65° , Calculated: 64°
Other characteristics Radioactive

Umohoide's type location is in Marysvale, the mineral was first described by Paul F. Kerr and G. P. Brophy in 1953.[4]

References

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. F. Dal Bo, F. Hatert, S. Philippo (2018). "Supergene Uranyl Mineralization of the Rabejac Deposit, Lodève, France." Minerals, Volume 8, Issue 9.
  3. "Umohoite: Umohoite mineral information and data". mindat.org. Retrieved 2019-08-14.
  4. Brophy, G.P. & Kerr, P.F. (1953): Hydrous uranium molybdate in Marysvale ore. Annual Report June 30, 1952 - April 1, 1953 U.S.Atomic Energy Comm., RME-3046, 45-51.
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