Spinel (var. Pleonast)
From Gonovskoe, Aldan Region, Jakutia, Russia
Black Spinel xl (about 2.5 cm in diameter) grown on Diopside.
Russion geologists say that in this locality the largest Spinel xls occur world wide.
Anyway this black Spinel xls are really remarkable
Dimensions 4 x 3 x 2.5 cm