Klebelsbergite - Encyclopedia

    Class : Sulfates, chromates, molybdates
    Subclass : Anhydrous sulfates
    Crystal system : Orthorhombic
    Chemistry : Sb4O4(OH)2(SO4)
    Rarity : Very rare

Klebelsbergite is an extremely rare complex sulfate present in the oxidation zone of some rare antimony deposits. It was named in honor of Hungarian Minister of Education Kuno Klebelsberg. Klebelsbergite appears in dark yellow to orange-yellow, sometimes pink, acicular crystals, grouped in clumps.

Main photo : Klebelsbergite from Kremnica, Slovakia © Martin Stevco

Klebelsbergite from Kremnica, Slovakia © Christian Rewitzer
Klebelsbergite from Pereta Mine, Tuscany, Italy © Elmar Lackner
Klebelsbergite from Pereta Mine, Tuscany, Italy © Giuseppe Finello
Klebelsbergite from Pereta Mine, Tuscany, Italy © Angelo Brambilla

Klebelsbergite in the World

Klebelsbergite is known very locally at the Baia Sprie mine (Romania), at Cetine but especially at Pereta (Tuscany, Italy) in superb 2 cm crystals resting on stibnite. It is also found in Kremnica (Slovakia) as well as at the Goesdorf mine (Luxembourg).

Klebelsbergite in France

Klebelsbergite is known at Ally (Haute-Loire), at Ty Gardien (Finistère) and at Jas Roux near Gap (Hautes-Alpes).

Twinning

No twin known for this mineral species.

Fakes and treatments

No fakes recorded for this mineral species.


Hardness : 3.5 to 4
Density : 4.62
Fracture : Undetermined
Streak : White to yellow

TP : Transparent
RI : Undetermined
Birefringence : Undetermined
Optical character : Biaxial -
Pleochroism : Visible
Fluorescence : None

Solubility : Hydrochloric acid

Magnetism : NoneRadioactivity : None

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