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 | |
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General | |
Category | Oxide and Hydroxide |
Formula (repeating unit) | (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 |
Umohoide's type location is in Marysvale, the mineral was first described by Paul F. Kerr and G. P. Brophy in 1953.[4]