General Information:
Chemical Formula:
Ca(UO2)3(SeO3)2(OH)4-4(H2O)
Composition:
(Molecular Weight = 1,244.17 gm)
Calcium 3.22 % Ca
Uranium 57.39 % U
Hydrogen 0.97 % H
Selenium 12.69 % Se
Oxygen 25.72 % O
Empirical Formula:
Ca(UO2)3(SeO3)2(OH)4·4(H2O)
Environment:
In the alteration zone.
IMA Status:
Approved IMA
Locality:
Shinkolobwe uranium deposit, Shaba, Zaire.
Name Origin:
For Dr. Paul Piret (1932- ), Professor of Crystallography, University of Louvain-la-Neuve, Belgium.
Physical Properties:
Cleavage:
[001] Good
Color:
lemon yellow.
Density:
4 - 4.01, Average = 4
Diaphaniety:
Transparent to translucent
Habits:
Tabular - Form dimensions are thin in one direction., Acicular - Occurs as needle-like crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
2.5 - Finger Nail
Luminescence:
Non-fluorescent.
Luster:
Pearly
Streak:
pale yellow
More details...