Colorless to light purple cubic crystals. The largest crystal is 3.5cm on edge. All crystals characteristically have a darker purple color and the corners are more transparent then the rest of the crystal. Limestone matrix with white Dolomite crystals. There is no damage except one of the smaller crystals at the base has been dinged. It's a pretty good specimen.
Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments