General Information:
Chemical Formula:
Pb9Mg9Si9O24(OH)24
Composition:
(Molecular Weight = 3,128.48 gm)
Magnesium 6.99 % Mg
Silicon 8.08 % Si
Hydrogen 0.77 % H
Lead 59.61 % Pb
Oxygen 24.55 % O
Empirical Formula:
Pb9Mg9Si9O24(OH)24
Locality:
Langbanshyttan, Vermland. Sweden.
Name Origin:
Named fro the Greek for "lead" and "leaf", in allusion to its composition and foliated habit.
Physical Properties:
Cleavage:
[0001] Perfect
Color:
colorless, pale green, or pale yellow.
Density:
4.7
Diaphaniety:
Transparent to translucent
Habits:
Massive - Lamellar - Distinctly foliated fine-grained forms., ,
Hardness:
3-4 - Calcite-Fluorite
Luster:
Vitreous - Pearly
Streak:
white
More details...