Images
Formula: Pb8As3+4O11Cl6
Arsenite containing halogen
Crystal System: Monoclinic
Specific gravity: 6.0 calculated
Hardness: 3
Streak: White
Colour: Brown
Environments
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).
Back to Minerals