Znucalite

General Information: Chemical Formula:CaZn11(UO2)(CO3)3(OH)20·4(H2O) Composition:(Molecular Weight = 1,621.63 gm)Calcium 2.47 % CaUranium 14.68 % U Zinc 44.36 % ZnHydrogen 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:whiteMore details...

CaZn12( O2)(CO3)3(OH)22 4(H2O)