LORANDITE

    Class : Sulfides and sulfosalts
    Subclass : Sulfosalts
    Crystal system : Monoclinic
    Chemistry : TlAsS2
    Rarity : Very rare

Lorandite is an arsenic thallium sulfide. It is a very rare mineral which is found in mercury and arsenic hydrothermal veins linked to the volcanism of recent chains or to hydrothermalized rocks. It was named in honor of Eötvös Lorand, Professor of Physics at the University of Budapest (Hungary). Lorandite forms short, stubby crystals that are red to dark red in color and have an adamantine luster.

Main photo : Lorandite and realgar from Crven Dol, Allchar, Macedonia © Stephan Wolfsried

1 cm lorandite on calcite from Mercur Mine, Utah, USA © Timothy Blackwood
Lorandite and realgar from Crven Dol, Allchar, Macedonia © Stephan Wolfsried
Lorandite from Crven Dol, Allchar, Macedonia © Stephan Wolfsried
Lorandite from Crven Dol, Allchar, Macedonia © Stephan Wolfsried

Lorandite in the World

Lorandite is known from less than five deposits in the world, Allchar (Macedonia), Lengenbach, near Binn (Switzerland) and Mercur Mine (Utah) having provided the best specimens whose crystals do not exceed one centimeter.

Lorandite in France

Lorandite is not present in the French underground.

Twinning

No twins known for this mineral species.

Fakes and treatments

No fakes recorded for this mineral species.


Hardness : 2 to 2.5
Density : 5.53
Fracture : Undetermined
Streak : Red

TP : Translucent to transparent
RI : 2.720
Birefringence : -
Optical character : Biaxial +
Pleochroism : Low
Fluorescence : None

Solubility : Nitric acid

Magnetism : NoneRadioactivity : None

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