FIEDLERITE

    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

Fiedlerite is known in 2 mm crystals in the slag of the Laurion mines (Greece) as well as in those of Baratti Beach (Tuscany, Italy) and the silver mine near Ogies (South Africa).

Right photo : Fiedlerite from Lavrion, Greece © Christian Rewitzer

Fiedlerite in France

Fiedlerite is not known in the French underground.

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

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