Composition: Pb2ZnFe3+2(Fe3+,Zn)(AsO4)4(OH)8[(OH),O]2
Crystal System : Triclinic
Colours: Reddish-brown
Lustre : Sub-adamantine
Hardness (H) : 3
Specific Gravity (S.G) : 5.10
Year of Discovery: 1978
IMA Number: 1978-079
IMA Status: Approved
Discovered By: Wolfgang Bartelke (German collector)
Named for: Christopher James (Tsumeb mining engineer)
References: Keller et al. (1981a)

Tsumeb is the Type Locality


Very rare. The level from which the type specimen was collected is not known.


  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

The type assemblage includes duftite, goethite and tsumcorite.

Jamesite is easily overlooked, and readily confused with goethite. It can also be confused with ludlockite or altered carminite, although the associations of those minerals are very different.