Composition: AsSbO3
Crystal System : Monoclinic
Colours: Colourless
Lustre : Adamantine
Hardness (H) : 2
Specific Gravity (S.G) : 5.01
Year of Discovery: 2007
IMA Number: 2007-028
IMA Status: Approved
Discovered By: Dave Bunk (American dealer)
Named for: Composition/relationship (to claudetite)

Tsumeb is the Type Locality


Extremely rare. Second (or third ?) oxidation zone.


  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

In a vug in massive tennantite, with leiteite, ludlockite, smithsonite, and quartz. Bladed crystals of stibioclaudetite, to 6mm, are colourless and transparent, with an adamantine lustre and a white streak. Perfect cleavage on {010}. Cleavage plates are flexible and deform similarly to gypsum.