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Fluorite has perfect cleavage in three directions and is thus very unstable to physical abuse. It is also very soft and easy to scratch. It should never be used in rings. It has a strong fluorescence. Fluorite is also heat sensitive and can be made to crack when heated. Most gemstone fluorite has been irradiated to deepen color.
Fluorite can be found in blue, purple, green, yellow, raspberry, and most other colors. It is often cut from starting material with "stripes" of color running through it, and produces multi-colored gems. The market has been flooded with gems from China in the past few years. It is available in very large sizes, but due to its limited value in jewelry it is more of collectors stone and nor particularly expensive.
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