Calvertite


Composition: Cu5Ge0.5S4
Crystal System : Cubic
Colours: Black
Lustre : Metallic
Hardness (H) : 4-5
Specific Gravity (S.G) : 5.239
Year of Discovery: 1996
IMA Number: 2006-030
IMA Status: Approved
References: Jambor et al. (2007)

 Tsumeb is the Type Locality

Distribution

Extremely rare (?). Visible in polished section only.

Occurrence

  • Hypogene
  • 2nd Oxidation Zone

Notable Finds

Identified on a single specimen of partly oxidising sulphide, comprising renierite, tennantite, gallite, and chalcocite.