The sensation of the years 2015 - 2016: in addition to what are probably the world's best wurtzite crystals, the world's best alabandine crystals also came to light from the tanzanite mines. They have been known for a long time, the miners call them "chuma", the Swahili word for iron. They thought these crystals were rotten pyrite crystals. These crystals are a combination of cube and octahedron, the unusually large number of vicinal faces are interesting.
Here is a larger crystal that has several smaller crystals on its back
Mererani, Simanjiro, Tanzania
4*3.2cm
