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Description: Fluorite often forms coarse cleavable masses or cubic crystals. It can take on a range of attractive colors, most often purple. Fluorite occurs in all types of hydrothermal deposits. It also forms as an accessory in igneous rocks, especially syenites and granite pegmatites. In Wisconsin, most fluorite localities are in the Wausau area, associated with the Wausau and Stettin plutons.
Also known as opalite and Tifanny stone, opal fluorite is a purple gemstone with swirls of lavender and white, earning the gemstone the nickname ice cream opal. This purple rock is composed predominantly of opalized stone, mixed with other minerals like quartz and chalcedony.hile most popular in red, garnet also occurs as purple stones. The purple crystals come from the varieties of garnet called pyrope and spessartine. Blue garnet, the rarest of all garnets, itself turns into a purple stone under an incandescent light.