Hallimondite

General Information:
 Chemical Formula:
Pb2(UO2)(AsO4)2
 Composition:
(Molecular Weight = 962.27 gm)
Uranium 24.74 % U 
Arsenic 15.57 % As
Lead 43.07 % Pb
Oxygen 16.63 % O 
 Empirical Formula:
Pb2(UO2)(AsO4)2
 IMA Status:
Approved IMA 1965
Physical Properties:
 Cleavage:
[???] Indistinct
 Color:
yellow.
 Density:
6.39
 Diaphaniety:
Transparent to Translucent
 Hardness:
2.5-3 - Finger Nail-Calcite
 Luster:
Subadamantine
 Streak:
light yellow
More details...