WEILERITE

    Class : Sulfates, chromates, molybdates
    Subclass : Anhydrous sulfates
    Crystal system : Trigonal
    Chemistry : BaAl3(AsO4)(SO4)(OH)6
    Rarity : Very rare

Weilerite is a mineral with a complex structure classified by some authors in the complex arsenates (beudantite group) and not in the sulfates. Today its name is increasingly replaced in the literature by arsenogorceixite. It is a secondary mineral of the oxidation zone of arsenic deposits, which often accompanies barite. It owes its name to its discovery locality : Weiler (Black Forest, Germany). Weilerite is found in earthy incrustations composed of tiny zoned crystals of less than 10 µm, with a pseudohexagonal appearance, associated with adamite and mimetite. Weilerite is white, sometimes faintly colored yellow, green or blue.

Main photo : Weilerite from the Clara Mine, Germany © Michael Förch

Weilerite from the Clara Mine, Germany © Stephan Wolfsried
Weilerite from the Clara Mine, Germany © Ko Jansen
Weilerite from the Clara Mine, Germany © Bert Schijf
Weilerite from Cap Garonne, Var, France © Jacques-Yves Desescaut

Weilerite in the World

Weilerite is known from a few deposits in the Black Forest such as the Clara Mine, Neubulach or Weiler (Germany) and also in Australia.

Weilerite in France

In France, weilerite is reported at Cap Garonne (Var), at Rompas (Nièvre) and at La Verrière near Villefranche-sur-Saône (Rhône).

Twinning

No twinning known for this mineral species.

Fakes and treatments

No fakes listed for this mineral species.


Hardness : 4
Density : 3.65
Fracture : Conchoidal
Streak : White

TP : Translucent to transparent
RI : 1.645
Birefringence : 0.000
Optical character : Uniaxial -
Pleochroism : None
Fluorescence : None

Solubility : -

Magnetism : NoneRadioactivity : None

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