Germanium-bearing nesosilicate (insular SiO4 groups), spinel group
Specific gravity: 5.51 calculated
Brunogeierite is a rare mineral found in very few localities.
In the Central Pyrenees in France, brunogeierite is associated with sphalerite and magnetite (HOM).
At the type locality, the Tsumeb Mine, Oshikoto Region, Namibia, brunogeierite was found in the lower oxidation zone of a dolostone-hosted hydrothermal polymetallic ore deposit, formed by alteration of germanium-rich sulphides (Mindat, HOM). It occurs as crusts 40-50 microns thick on tennantite, which encloses renierite and is surrounded by stottite (AM 58.348).
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