Chalcophanite


Composition: (Zn,Fe2+,Mn2+)Mn4+3O7.3H2O
Crystal System : Trigonal
Colours: Blue-black, iron-black
Lustre : Metallic
Hardness (H) : 2.5
Specific Gravity (S.G) : 3.9-4.1
References: Gebhard (1999)

Distribution

Very rare.

Occurrence

  • Supergene

Paragenetic and General Notes

As a component of black manganese oxide coatings on calcite and mottramite (Gebhard, 1999).