Composition: GaO(OH)
Crystal System : Orthorhombic
Colours: Pale green-yellow, beige
Lustre : Pearly
Specific Gravity (S.G) : 5.22
Year of Discovery: 2002
IMA Number: 2002-011
IMA Status: Approved
Named for: Composition/locality

Tsumeb is the Type Locality


Extremely rare. The type specimen is from the second oxidation zone.


  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

Tsumgallite occurs on tennantite / germanite ore, with söhngeite and zincian siderite, as scaly mica-like aggregates less than 1 mm across. The individual thin, platy crystals do not exceed 40μm in size.

Previously designated as the unknown "Mineral GF" (Pinch and Wilson, 1977).