This is a fine specimen of the very rare sulfate Nikischerite (named for Tony Nikischer). This mineral is the iron analogue of the Manganese species Shigaite. This piece features a sharp, lustrous, layered, beautiful green color spherical crystal groups measuring up to 7 mm across on matrix. These pieces are essentially from a one time find at Huanuni and no more have been found several years. This specimen was acquired personally at the mine at Huanuni by Brian Kosnar.