Znucalite

General Information:
 Chemical Formula:
CaZn11(UO2)(CO3)3(OH)20·4(H2O)
 Composition:
(Molecular Weight = 1,621.63 gm)
Calcium 2.47 % Ca
Uranium 14.68 % U 
Zinc 44.36 % Zn
Hydrogen 1.74 % H 
Carbon 2.22 % C 
Oxygen 34.53 % O 
 Empirical Formula:
CaZn11(UO2)(CO3)3(OH)20·4(H2O)
 Environment:
Oxidation product of the U dimp material at the mine.
 IMA Status:
Approved IMA
 Locality:
Lill mine, Pribram, central Bohemia, Czech Republic.
 Name Origin:
Named for the composition (Zn, U, Calcium).
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
white, light yellow, or grayish yellow.
 Density:
3.01 - 3.1, Average = 3.05
 Diaphaniety:
Translucent
 Habits:
Encrustations - Forms crust-like aggregates on matrix., Aggregates - Made of numerous individual crystals or clusters.,
 Luminescence:
Fluorescent, Short UV=greenish yellow, Long UV=greenish yellow.
 Luster:
Silky
 Streak:
white
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