Coronadite


Composition: Pb(Mn4+6 Mn3+2)8O16
Crystal System : Monoclinic; (ps. Tetragonal)
Colours: Dark-grey, black
Lustre : Sub-metallic, dull, earthy
Hardness (H) : 4.5-5.0
Specific Gravity (S.G) : 5.25-5.51

Distribution

Rare.

Occurrence

  • Supergene

Paragenetic and General Notes

As black coatings, sometimes with other manganese oxides.