| Umohoite | |
|---|---|
 | |
| General | |
| Category | Oxide and Hydroxide |
| Formula | (UO2)MoO4·2H2O |
| IMA symbol | Umo1 |
| Crystal system | Triclinic |
| Identification | |
| Color | Black, blue-black, dark green, orange-red 2 |
| Cleavage | Perfect on {001} |
| Mohs scale hardness | 2 |
| Luster | Vitreous |
| Streak | Blue gray |
| Diaphaneity | Opaque |
| Density | 4.53 - 4.66 g/cm3 (Measured) 4.49(3) g/cm3 (Calculated) |
| Refractive index | nα = 1.660 nβ = 1.831 nγ = 1.915 |
| 2V angle | Measured: 65°, Calculated: 64° |
| Other characteristics |  Radioactive |
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's type location is in Marysvale, the mineral was first described by Paul F. Kerr and G. P. Brophy in 1953.4
References
References
- 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.
- F. Dal Bo, F. Hatert, S. Philippo (2018). "Supergene Uranyl Mineralization of the Rabejac Deposit, Lodève, France." Minerals, Volume 8, Issue 9.
- "Umohoite: Umohoite mineral information and data". mindat.org. Retrieved 2019-08-14.
- 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.