Fiedlerite - Encyclopedia
Class : Halides
Subclass : Oxychlorides
Crystal system : Monoclinic
Chemistry : Pb3Cl4F(OH) H2O
Rarity : Very rare
Fiedlerite is a very rare hydrated chloro-fluoride of lead. It is an “anthropogenic” mineral, formed by the reaction between salt water and lead slag, vestiges of old exploitations. It was named in honor of the Saxon mining engineer Carl Gustav Fiedler. Fiedlerite forms small crystals of 2 mm maximum, colorless, white or yellowish lamellar or tabular, encrusting the submerged slag.
Main photo : Fiedlerite from Lavrion, Greece © Gianfranco Ciccolini
Fiedlerite in the World
Twinning
No twins known for this mineral species.
Fakes and treatments
No fakes recorded for this mineral species.
Hardness : 3.5
Density : 5.88
Fracture : Undetermined
Streak : White
TP : Transparent
RI : 1.980 to 2.100
Birefringence : 0.120
Optical character : Biaxial -
Pleochroism : None
Fluorescence : None
Solubility : Nitric acid
Magnetism : None
Radioactivity : None