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Formula: Fe2+2Ge4+O4
Germanium-bearing nesosilicate (insular SiO4 groups),
ulvöspinel subgroup,
oxyspinel group,
spinel supergroup
Crystal System: Isometric
Specific gravity: 5.51 calculated
Hardness: 5
Colour: Grey-black
Magnetism: Ferromagnetic
Environments
Brunogeierite is a rare mineral found in very few localities.
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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