General Information:
Chemical Formula:Pb6As+++2O7Cl4
Composition:(Molecular Weight = 1,646.85 gm)Arsenic 9.10 %
AsLead 75.49 %
PbChlorine 8.61 %
ClOxygen 6.80 %
O Empirical Formula: Pb6As2O7Cl4
Locality:Langban and Harstig mines, Varmland, Sweden.
Name Origin:Named from the Greek for "unusual", in reference to the composition.
Physical Properties: Cleavage:[001] Perfect
Color:green yellow, yellow, or orange.
Density:6.9 - 7.1, Average = 7
Diaphaniety:Translucent
Habits:Massive - Uniformly indistinguishable crystals forming large masses., Encrustations - Forms crust-like aggregates on matrix., Tabular - Form dimensions are thin in one direction.
Hardness:2.5 - Finger Nail
Luminescence:Non-fluorescent.
Luster:Vitreous - Greasy
Streak:light yellow
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