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Formula: CaCu4(AsO4)2(AsO3OH)2.10H2O
Hydrated acid arsenate,
ondrušite group,
lindackerite supergroup
Crystal System: Triclinic
Specific gravity: 3.26 measured 3.12 calculated. Measured density is affected by admixed
lavendulan (Mindat)
Hardness: 2 to 3
Colour: White, whitish green, grey-green, apple-green
Luminescence: No fluorescence under UV
Environments
Sedimentary environments
Hydrothermal environments
Localities
The type locality is the Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic. Ondrušite
was found in material from old workings at the Geister vein, at the Rovnost mine, and the Geschieber vein at the Daniel level,
at the Svornost mine, both in the Jáchymov ore district. The district is a classic example of
silver + arsenic +
cobalt + nickel +
bismuth and of uranium vein-type
hydrothermal mineralisation. The ore veins cut a complex of medium-grade metasedimentary rocks, in the envelope of a
granite pluton. The majority of the ore minerals were deposited during
mineralisation from mesothermal fluids.
Primary and
supergene mineralisation in this
district resulted in more than 400 mineral species.
Ondrušite was found in the association of lindackerite,
geminite, lavendulan,
slavkovite, strashimirite,
olivenite, picropharmacolite and
köttigite; it was formed by the weathering in strongly acidic conditions of
primary sulphides
(tennantite and chalcopyrite)
disseminated in a quartz gangue
(CM 49.885-897).
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