Larger specimen of two large Fluorite crystals side-by-side with numerous Chalcopyrite crystals to 3mm occupying the many crevices produced by deep growth hillocks. Along side several Chalcopyrite crystals are 2-3mm Calcite crystals.
Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments