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Formula: H2NaZn3(AsO4)3
Arsenate,
alluaudite group
Crystal System: Monoclinic
Specific gravity: > 4.24 measured, 4.49 calculated
Hardness: 4
Streak: White
Colour: Pale violet
Common impurities: Mg
Environments
O'Danielite is a rare secondary arsenate.
At the type locality, the Tsumeb Mine, Oshikoto Region, Namibia, o'danielite occurs as a
secondary mineral in corroded
copper ore in the oxidised zone of a
dolostone-hosted hydrothermal zinc-rich
polymetallic ore deposit (Webmin, Mindat)
Associated minerals include tennantite,
chalcocite,
copper-bearing adamite,
stranskiite,
lavendulan, köttigite,
tsumcorite, koritnigite and
prosperite (HOM, Mindat, CM 59.243-263).
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