Sahlinite

General Information:
 Chemical Formula:
Pb14(AsO4)2O9Cl4
 Composition:
(Molecular Weight = 3,464.44 gm)
Arsenic 4.33 % As
Lead 83.73 % Pb
Chlorine 4.09 % Cl
Oxygen 7.85 % O 
 Empirical Formula:
Pb14(AsO4)2O9Cl4
 Environment:
Found in dolomite rock with other Mn oxides.
 Locality:
Langban, Filipstad, Varmland, Sweden.
 Name Origin:
Named for Carl Andreas Sahlin (1861-1943), chemist and manager of the iron works at Laxa, Sweden.
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
light yellow or pale sulfur yellow.
 Density:
8
 Diaphaniety:
Translucent
 Habits:
Thin - Flat dimensioned crystals., Scaly - Morphology like fish scales., Aggregates - Made of numerous individual crystals or clusters.
 Hardness:
2-3 - Gypsum-Calcite
 Luster:
Adamantine
 Streak:
light yellow
More details...