General Information:
Chemical Formula:
PbFCl
Composition:
(Molecular Weight = 261.65 gm)
Lead 79.19 % Pb
Chlorine 13.55 % Cl
Fluorine 7.26 % F
Empirical Formula:
PbFCl
Environment:
Secondary mineral.
Locality:
Cromford, near Matlock, Derbyshire. Ancient lead slags at Laurium, Greece.
Name Origin:
Named from its locality.
Physical Properties:
Cleavage:
[001] Perfect
Color:
brownish yellow, colorless, green yellow, or dark yellow brown.
Density:
7.12
Diaphaniety:
Transparent
Habits:
Tabular - Form dimensions are thin in one direction., Crystalline - Coarse - Occurs as well-formed coarse sized crystals.,
Hardness:
2.5-3 - Finger Nail-Calcite
Luminescence:
Fluorescent.
Luster:
Adamantine - Pearly
Streak:
white
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