TRÖGERITE

    Class : Phosphates, arsenates, vanadates
    Subclass : Uranyl arsenates
    Crystal system : Tetragonal
    Chemistry : (UO2)3(AsO4)2 12H2O
    Rarity : Very rare

Trögerite is an arsenate formed in the oxidation zone of some uranium deposits. It was named in honor of R. Tröger, Mine Manager at Schneeberg (Germany). Trögerite forms thin small tabular crystals of 1 mm maximum, frequently asymmetrical, grouped in parallel aggregates, of lemon yellow color. Intergrowths with zeunerite seem common.

Main photo : Trögerite and strengite from Adam Heber Mine, Schneeberg, Germany © Stephan Wolfsried

Trögerite from Weisser Hirsch Mine, Neustädtl, Germany © Uwe Haubenreisser
Trögerite from Weisser Hirsch Mine, Neustädtl, Germany © Stephan Wolfsried
Trögerite from Jachymov, Czech Republic © Alex Earl
Trögerite from Riviéral, Hérault, France © Frédéric Bonnet

Trögerite in the World

Trögerite is known in about ten localities throughout the world. Its best specimens seem to come from Germany, notably from the Weisser Hirsch mine near Neustädtl and the Daniel mine near Schneeberg. It is also known in Great Britain and the United States.

Trögerite in France

In France, trögerite is described in the uranium deposits of the Lodève Basin (Hérault).

Twinning

No twin known for this mineral species.

Fakes and treatments

No fakes listed for this mineral species.


Hardness : 2 to 3
Density : 3.3 to 3.55
Fracture : Micaceous
Streak : White to pale yellow

TP : Translucent to transparent
RI : 1.585 to 1.630
Birefringence : 0.045
Optical character : Uniaxial -
Pleochroism : Visible
Fluorescence : Yellow

Solubility : Acids

Magnetism : NoneRadioactivity : Strong

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