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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
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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