Gebhardite

minerals

mimetite

reinerite

fraipontite

Images

Formula: Pb8As3+4O11Cl6
Arsenite containing halogen
Specific gravity: 6
Hardness: 3
Streak: White
Colour: Brown
Environments

Hydrothermal envoronments

Gebhardite is a very rare mineral, to date (September 2021) known only from the type locality.

Localities

At the type locality, the Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia, gebhardite has been found on only one specimen of highly oxidised ore from the lower oxidation zone of a dolostone-hosted hydrothermal polymetallic ore deposit. The specimen is a weathered 5 x 5 x 3 cm mass of white carbonates and silicates coated with a varied association of secondary minerals. Gebhardite in acicular crystals up to 2 mm long is in contact with mimetite. Other associated secondary minerals include reinerite, fraipontite, smithsonite, willemite and hematite (AM 70.215, Webmin).

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