General Information:
Chemical Formula:
(UO2)·5(UO3)·10(H2O)
Composition:
(Molecular Weight = 304.04 gm)
Uranium 78.29 % U
Hydrogen 0.66 % H
Oxygen 21.05 % O
Empirical Formula:
UO2(OH)2
Environment:
Sedimentary uranium deposits.
Locality:
Kasolo, Belgian Congo.
Name Origin:
From the Greek ianthinos, "violet."
Physical Properties:
Cleavage:
[100] Perfect
Color:
violet black, violet, or violet purple.
Density:
5.16
Diaphaniety:
Transparent to translucent
Habits:
Acicular - Occurs as needle-like crystals., Granular - Generally occurs as anhedral to subhedral crystals in matrix.,
Hardness:
2.5-3 - Finger Nail-Calcite
Luster:
Sub Metallic
Streak:
violet brown
More details...