Umohoite
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| Umohoite | |
|---|---|
 | |
| General | |
| Category | Oxide and Hydroxide |
| Formula | (UO2)MoO4·2H2O |
| IMA symbol | Umo[1] |
| 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]