Stranskiite

stranskiite

leiteite

o'danielite

bayldonite

Images

Formula: CuZn2(AsO4)2
Anhydrous normal arsenate
Crystal System: Triclinic
Specific gravity: 5.23 to 5.3 measured, 5.05 calculated
Hardness: 4
Colour: Cyan blue
Environments

Hydrothermal environments

Stranskiite is a very rare secondary arsenate.

Localities

At the type locality, the Tsumeb Mine, Oshikoto Region, Namibia, stranskiite occurs as a secondary mineral in the oxidation zone of a dolostone hosted hydrothermal polymetallic ore deposit (Webmin, Mindat, HOM).
Associated minerals include chalcocite, tennantite, galena, schultenite, anglesite, bayldonite, copper-bearing adamite, keyite, olivenite, claudetite, ludlockite, tsumcorite, koritnigite, warikahnite, duftite, carminite, beudantite, scorodite, o’danielite, zincroselite, claraite and leiteite (HOM, Dana).
In 1976 a specimen of stranskiite was found at in the lower oxidation zone at a depth of 950 m below the surface. It is found in massive tennantite as mm to cm sized inclusions, associated with other arsenates such as adamite, olivenite and schultenite. The tennantite also contains small amounts of galena, which presumably supply lead for secondary minerals such as schultenite (AM63.213-215).

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