Slavkovite

slavkovite

lavendulan

geminite

lindackerite

Images

Formula: Cu13(AsO4)6(AsO3OH)4.23H2O
Hydrated arsenate, copper-bearing mineral
Crystal system: Triclinic
Specific gravity: 3.05 measured, 3.05 calculated for the empirical formula
Hardness: 3½ to 4
Streak: White
Colour: Pale green, colourless with a greenish tint, light blue, blue-green
Luminescence: Not fluorescent under short wave or long wave UV
Environments

Hydrothermal environments

Localities

The type locality is the Daniel adit level, Geschieber vein, Svornost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic. The Jáchymov ore district is a classic example of Ag + As + Co + Ni + Bi and of U vein-type hydrothermal mineralisation. Primary and supergene mineralisation in the district resulted in extraordinarily rich associations; more than 400 mineral species have been found there.
Slavkovite was found associated with lavendulan, geminite, lindackerite and ondrušite; it formed by the weathering of primary tennantite and chalcopyrite. It occurs as coatings formed by pale green rosettes up to 1 mm across or individual spherical aggregates up to 5 mm across. Individual acicular to lath-like crystals up to 1 mm long and 0.05 mm thick are colourless with a greenish tint. Slavkovite is translucent (in aggregates) to transparent (in crystals), and has a white streak and a vitreous lustre (CM 48.5.1157-1170).
Slavkovite from Jáchymov - Image

At Huber stock, Krásno, Sokolov District, Karlovy Vary Region, Czech Republic, slavkovite has been found in the abandoned Huber open pit, near a weathered vein carrying tennantite and cuprite in its centre. It is associated with clay minerals and amorphous arsenates of Cu and Fe.
Slavkovite from Krásno forms light blue to blue-green crystalline coatings up to 2 cm in size, which are composed of imperfect, very thin, tabular crystals up to 50 mm in size. It also occurs in a mixture with clay minerals as light blue aggregates cementing weathered gangue, or botryoidal aggregates in a weathered ore vein (CM 48.5.1157-1170).

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