Composition: CuO
Crystal System : Monoclinic
Colours: Steel-grey, black
Lustre : Metallic, dull
Hardness (H) : 3.5
Specific Gravity (S.G) : 6.4


Rare. Widely distributed but in small amounts (Lombaard et al,. 1986).


  • Supergene
  • 1st Oxidation Zone
  • 2nd Oxidation Zone
  • 3rd Oxidation Zone

Paragenetic and General Notes

Tenorite occurs mainly as dull black crusts on other minerals, but "rarely as thin, flexible, translucent tablets with irregular borders" (Pinch and Wilson, 1977).

Gebhard (1999) notes the occureence of tenorite as plates and crusts on some azurite crystals.