Javorieite

javorieite

rinneite

scheelite

powellite

Images

Formula: KFeCl₃
Valence: KFe²⁺Cl₃
Chloride
Crystal System: Orthorhombic
Specific gravity: 2.82 calculated
Colour: Green
Solubility: Extremely hygroscopic and readily oxidised if exposed to the air
Environments

Volcanic igneous environments

Javorieite is a relatively new mineral, approved in 2016 and to date (May 2026) reported only from the type locality.

Localities

At the type locality, Biely vrch, Detva, Detva District, Banská Bystrica Region, Slovakia, javorieite is commonly hosted by salt melt inclusions enclosed in vein quartz. The mineral name refers to the Javorie stratovolcano, which hosts most porphyry gold systems in this volcanic field. Within the inclusions, javorieite occurs in the form of small (up to 15 µm) green anhedral crystals, which melt in the range 320°C to 338°C when heated. It is extremely hygroscopic and readily oxidised if exposed to the air (EJM 29.6.995-1004).
Associated minerals include halite, chlorocalcite, rinneite, a phase close to Fe₂(OH)₃Cl (probably hibbingite), fluorite, scheelite-powellite, unidentified Ba-, Zn-, Pb- bearing chlorides, some salt hydrates (eg FeCl₂.2H₂O), magnetite, K-feldspar, pyroxene, scheelite and chalcopyrite (HOM).

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