Gabrielsonite

General Information:
 Chemical Formula:
PbFe++(AsO4)(OH)
 Composition:
(Molecular Weight = 418.97 gm)
Iron 13.33 % Fe
Arsenic 17.88 % As
Hydrogen 0.24 % H 
Lead 49.45 % Pb
Oxygen 19.09 % O 
 Empirical Formula:
PbFe2+(AsO4)(OH)
 IMA Status:
Approved IMA 1967
Physical Properties:
 Cleavage:
None
 Color:
greenish brown or black.
 Density:
6.67
 Diaphaniety:
Transparent to Opaque
 Hardness:
3.5 - Copper Penny
 Luster:
Adamantine
 Streak:
light brown
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