General Information:
Chemical Formula:
Pb12O6Mn(Mg,Mn)2(Mn,Mg)4(SO4)(CO3)4Cl4(OH)12
Composition:
(Molecular Weight = 3,587.70 gm)
Magnesium 1.35 % Mg
Manganese 7.66 % Mn
Hydrogen 0.34 % H
Lead 69.30 % Pb
Carbon 1.34 % C
Sulfur 0.89 % S
Chlorine 3.95 % Cl
Oxygen 15.16 % O
Empirical Formula:
Pb12O6Mg2Mn2+5(SO4)(CO3)4(OH)12Cl4
Environment:
Crust-like overgrowths and simple tetragonal tablets on subhedral lead, and on lead wire in a calcite-rich Mn oxide ore matrix. A late-stage fissure mineral in a skarn assemblage,
IMA Status:
Approved IMA (Dana # Added)
Locality:
Langban, Varmland, Sweden.
Name Origin:
The name si from the Greek philos (=loving) and lithos (=stone) in honor of the Frends of Mineralogy.
Physical Properties:
Cleavage:
None
Color:
green or emerald green.
Density:
5.91
Diaphaniety:
Transparent to translucent
Habits:
Encrustations - Forms crust-like aggregates on matrix., Tabular - Form dimensions are thin in one direction.,
Hardness:
3-4 - Calcite-Fluorite
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Streak:
white
More details...