Composition: PbGa3[(AsO4),(SO4)]2(OH)6
Crystal System : Trigonal
Colours: Cream, pale-yellow, greenish
Lustre : Vitreous
Hardness (H) : 4
Specific Gravity (S.G) : 4.87
Year of Discovery: 1994
IMA Number: 1994-021
IMA Status: Approved
Discovered By: Mark Feinglos (American collector)
Named for: Composition/relationship (to beudantite)
References: Jambor et al. (1996)

Tsumeb is the Type Locality


Extremely rare. The type material was collected in 1960, but from an unknown location in the mine.


  • Supergene
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Paragenetic and General Notes

The type specimen occurs on renierite/tennantite(Ga-rich)/chalcocite ore with hematite; goethite; stolzite; silver; otjisumeite. Within the gallobeudantite crystals are zones containing Ga-rich beudantite and hidalgoite, also unnamed Ga analogues of arsenocrandallite, kintoreite, segnitite, and corkite. Also as disc-like sub-mm yellow crystals on gallium-rich scorodite (Gebhard, 1999).