Helmutwinklerite

minerals

tennantite

willemite

tsumcorite

Formula: PbZn2(AsO4)2.2H2O
Hydrated normal arsenate, tsumcorite group
Specific gravity: 5.3
Hardness: 4½
Streak: White
Colour: Colourless to sky blue
Solubility: Dissolves in cold 10N hydrochloric acid (Dana)
Common impurities: Cu
Environments

Hydrothermal environments

Helmutwinklerite is a very rare secondary mineral found in corroded tennantite ore from a dolostone - hosted hydrothermal polymetallic ore deposit (Webmin).

Localities

At the type locality, the Tsumeb mine, Tsumeb, Oshikoto Region, Namibia, helmutwinklerite occurs in cavities in corroded tennantite from a dolostone - hosted hydrothermal polymetallic ore deposit. Associated minerals include tennantite, quartz and willemite (AM 65.1067, HOM, Dana)

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