General Information:
Chemical Formula:
PbHAsO4
Composition:
(Molecular Weight = 347.13 gm)
Arsenic 21.58 % As
Hydrogen 0.29 % H
Lead 59.69 % Pb
Oxygen 18.44 % O
Empirical Formula:
PbH(AsO4)
Environment:
Secondary mineral in lead arsenice ores. Used as an insecticide as commercially prepared lead arsenate.
Locality:
Tsumeb, Namibia.
Name Origin:
Named for Baron August Benjamin de Schulten (1856-1912) of Helsingfors and Paris, who prepared and described artificial crystals of the compound.
Physical Properties:
Cleavage:
[010] Good
Color:
colorless, pale yellow, or white.
Density:
5.943
Diaphaniety:
Transparent
Habits:
Tabular - Form dimensions are thin in one direction., Striated - Parallel lines on crystal surface or cleavage face.,
Hardness:
2.5 - Finger Nail
Luster:
Vitreous - Adamantine
Streak:
white
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