From the one time find at the end of Summer 2000 in Bolivia!! This is a great specimen of the immensely rare and recently approved sulfate Nikischerite (named for Tony Nikischer). This mineral is the iron analogue of the Manganese species Shigaite. This piece features a fantastic, sharp, somewhat lustrous, spherical crystal group of deep green thick bladed crystals. It is incredibly difficult to find specimens of this species. Keep in mind that these pieces are essentially from a one time find at Huanuni and there has yet to be any more to hit the market for several years. This specimen was acquired personally at the mine at Huanuni by Brian Kosnar, and it is one of the rarest minerals in the world that you can actually see with the naked eye. In Brian's estimation, there may be no more than 200 specimens of this species in the world. Don't miss out on this opportunity to own a fantastic specimen of a very rare species. 1.1 x 0.9 x 0.8cm