Tsumeb is the Type Locality
Very common. Germanite was discovered in the upper levels of the mine (first oxidation zone).
- 1st Oxidation Zone
- 2nd Oxidation Zone
- 3rd Oxidation Zone
The first Ge mineral discovered at Tsumeb, as large, "pure" masses between depths of 140m and 180m. A second germanite zone occurred between 20 and 26 levels, with rare crystals of germanite to 5mm in cavities in the ore. A third zone was found deep in the third oxidation zone, (46 and 47 Levels) from which the largest recorded germanite crystal (a 30 mm tetrahedron) was recovered (Gebhard, 1999).
Paragenetic and General Notes
In massive sulphide ores comprising renierite; gallite; colusite; sphalerite; tennantite; galena; pyrite; chalcocite. Most, if not all, secondary Ge- and Ga- bearing minerals tend to occur on altered germanite-bearing ores. Germanite is a common mineral at Tsumeb, but occurs mostly as as microscopic inclusions in galena and tennantite; larger masses are comparatively uncommon (Keller, 1977).