General Information:
Chemical Formula:
Ca3U++++(UO2)6(CO3)2(OH)18·3-5(H2O)
Composition:
(Molecular Weight = 2,458.63 gm)
Calcium 4.89 % Ca
Uranium 67.77 % U
Hydrogen 0.98 % H
Carbon 0.98 % C
Oxygen 25.38 % O
Empirical Formula:
Ca3U(UO2)6(CO3)2(OH)18·3(H2O)
Environment:
Alteration product of red rims around uraninite.
IMA Status:
Approved IMA 1959
Locality:
Shinkolobwe, Shaba, Zaire.
Name Origin:
Named for Jean Wyart (1902-1992), mineralogist at the Sorbonne, Paris.
Physical Properties:
Cleavage:
[001] Perfect, [010] Perfect
Color:
greenish black, black, or black violet.
Density:
4.69
Diaphaniety:
Translucent to Opaque
Habits:
Platy - Sheet forms (e.g. micas)., ,
Hardness:
3-4 - Calcite-Fluorite
Luster:
Vitreous - Dull
Streak:
brownish violet
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