Otjisumeite

otjisumeite

germanite

renierite

shaurteite

Images

Formula: PbGe4O9
Multiple oxide, germanium-bearing mineral
Crystal System: Triclinic
Hardness: 3
Colour: White, colourless
Environments

Sedimentary environments
Hydrothermal environments

Otjisumeite was approved in 1978 but to date (April 2023) it has been reported only from the type locality.

Localities

At the type locality, the Tsumeb mine, Tsumeb, Oshikoto Region, Namibia, otjisumeite occurs in small replacement cavities in germanium ore. The primary ore consists of tennantite, germanite and renierite. The secondary minerals in the cavities include chalcocite, calcite, quartz, siderite, gypsum, otjisumeite and schaurteite. The otjisumeite crystals are up to 1 mm in length and have a diameter of less than 0.1 mm; they have a columnar to fibrous habit and they usually form radiating aggregates (AM 72.1026-1027).
The mineralisation is hosted in dolostone (Mindat).

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