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Formula: PbFe2+Ge(Ge2O7)(OH)2.H2O
Germanate
Crystal System: Monoclinic
Specific gravity: 4.97 calculated
Hardness: 4
Streak: White
Colour: Colourless, white to very pale greenish
Solubility: Dissolves in hot hydrochloric acid
Environments
Sedimentary environments
Hydrothermal environments
Although bartelkeite was approved in 1979, to date (September 2023) it has been reported only from the type
locality.
Localities
At the type locality, the Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia, bartelkeite occurs as a very rare
mineral in cavities in oxidised primary
germanium ore from a
dolostone-hosted hydrothermal polymetallic ore deposit. Associated
minerals include germanite,
reniérite, tennantite and
galena
(HOM).
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