Here is a great specimen of the immensely rare and newly approved sulfate Nikischerite (analogue of shigaite). This piece features two fantastic deep forest green spherical crystal groups perched atop additional crystals of Nikischerite. 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 since several years ago now. 1 x 1 x 0.5 cm