Lepersonnite-(Gd)

General Information:
 Chemical Formula:
CaGd2(UO2)24(CO3)8(SiO4)4·48(H2O)
 Composition:
(Molecular Weight = 8,548.38 gm)
Calcium 0.47 % Ca
Gadolinium 3.68 % Gd
Uranium 66.83 % U 
Silicon 1.31 % Si
Hydrogen 1.13 % H 
Carbon 1.12 % C 
Oxygen 25.45 % O 
 Empirical Formula:
CaGd2(UO2)24(CO3)8(SiO4)4·48(H2O)
 Environment:
In a black crust in the lower portion of the oxidation zone.
 IMA Status:
Approved IMA 1981
 Locality:
Shinkolobwe, Shaba, Zaire.
 Name Origin:
Named after Jacques Lepersonne (1909-), honorary head of the Department of Geology and Mineralogy, Musee Royale de l'Afrique Centrale, Brussels, Belgium.
Physical Properties:
 Cleavage:
[1] Good
 Color:
bright yellow.
 Density:
3.97
 Diaphaniety:
Transparent to Translucent
 Habits:
Encrustations - Forms crust-like aggregates on matrix., Spherical - Spherical, rounded aggregates., Aggregates - Made of numerous individual crystals or clusters.
 Luminescence:
Non-fluorescent.
 Luster:
Vitreous (Glassy)
 Streak:
light yellow
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