Composition: Pb2CuAsO4MoO4(OH)
Crystal System : Monoclinic
Colours: Pale-green, apple-green, grass-green
Lustre : Adamantine, sub-adamantine, vitreous
Hardness (H) : 2-3
Specific Gravity (S.G) : 6.6
Year of Discovery: 1982
IMA Number: 1982-062
IMA Status: Approved
Discovered By: A. Deininger (collector)
Named for: Composition/relationship (with fornacite)

Tsumeb is the Type Locality


Very rare. Second oxidation zone.


  • Supergene
  • 2nd Oxidation Zone

Paragenetic and General Notes

Molybdofornacite occurs as prismatic to lath-like crystals to 1 mm, conspicuous, lime-green, and transparent, in a characteristic paragenesis with dioptase and wulfenite.