This Cubic Fluorite Perky Box Specimen comes from Thunder Bay, Ontario, Canada, Unusual for this Locality.
Fluorite is the mineral form of calcium fluoride, CaF₂. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as fluorite.