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Formula: GaO(OH)
Hydroxide, diaspore group,
gallium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 5.08 calculated
Hardness: 1 to 2
Streak: White
Colour: Pale greenish yellow to beige
Luminescence: No fluorescence under UV
Common impurities: Zn,Ge,Fe,Si
Environments
Sedimentary environments
Hydrothermal environments
Tsumgallite was approved in 2002, but to date (February 2023) it has been reported only from the type locality.
Localities
At the type locality, the Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia, tsumgallite occurs in vugs of rich
germanite ore, associated with
söhngeite, zinc-bearing
siderite, chalcocite and
quartz. The tsumgallite forms very thin platelets up to 40 x 40 microns and
0.5 to 1 microns thick
(CM 42.921-945).
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