Gaudefroyite on Andradite garnet

N'Chwaning II Mine, Kuruman, Northern Cape Province, South Africa.

Reference: 831

A large cabinet display piece of outstanding quality from the famous Kalahari Manganese Fields. The specimen is richly covered with bright black gaudefroyite crystals to about 7mm beautifully contrasting with the underlying bed of red andradite crystals.

Formulas: Gaudefroyite Ca₄Mn³⁺_2-3(BO₃)₃(CO₃)(O,OH)₃ ; Andradite garnet Ca₃Fe³⁺₂(SiO₄)₃