Manganoan Vesuvianite + Hausmannite 3.03 ct Cushion 11.00 x 6.00 x 4.30 mm z269

Description

Manganoan Vesuvianite + Hausmannite 3.03 ct Cushion 11.00 x 6.00 x 4.30 mm z269

Mangano-vesuvianite/hausmannite

Mangano-vesuvianite or Manganoan Vesuvianite with formula (Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10 , and hardness of 6.5. here is mixed with Hausmannite ,formula Mn2+Mn3+2O4, hardness 5.5.

This complex manganese oxide ,almost black contain small violet -purple Mangano-vesuvianite and it comes from NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa