Leogangite Locality: Vogelhalt District, Vogel Alp, Schwarzleograben, Hütten, Leogang, Saalfelden, Salzburg, Austria Field of view 4 mm. Depth of field is achieved with CombineZM. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Leogangite
Leogangite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Cu₁₀(AsO₄)₄(SO₄)(OH)₆·8H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: specific gravity 3.55; Light green streak; Vitreous luster; optically biaxial.
IMA symbol Lgg, IMA status: approved, named in 1998.
A secondary mineral coating limonitic dolostone breccia and filling voids in the oxidized zone of a pyrite, galena, tennantite deposit.
It is found associated with Olivenite, malachite, tyrolite, parnauite, strashimirite, euchroite, brochantite, langite, posnjakite, devilline.
The name refers to the city (Leogang) in Austria near the first found specimens.