Heinrichite

General Information:
 Chemical Formula:
Ba(UO2)2(AsO4)2·10-12(H2O)
 Composition:
(Molecular Weight = 1,153.39 gm)
Barium 11.91 % Ba
Uranium 41.27 % U 
Arsenic 12.99 % As
Hydrogen 1.92 % H 
Oxygen 31.90 % O 
 Empirical Formula:
Ba(UO2)2(AsO4)2·11(H2O)
Physical Properties:
 Cleavage:
[001] Perfect, [100] Distinct
 Color:
green, yellow, or yellow green.
 Density:
3.61
 Diaphaniety:
Transparent to Translucent
 Hardness:
2.5 - Finger Nail
 Luminescence:
Fluorescent.
 Luster:
Vitreous - Pearly
 Streak:
yellow white
More details...