This is a nice apple-green fluorite crystal cluster from China. The base of this cluster has been cut flat. This specimen has unique fluorescent properties under short wave UV, with the exterior of the crystals fluorescing purple and the interior exhibiting white fluorescence.
is a halide mineral comprised of calcium and fluorine, CaF2. The word fluorite is from the Latin fluo-, which means to flow. In 1852 fluorite gave its name to the phenomenon known as fluorescence, or the property of fluorite to glow a different color depending upon the bandwidth of the ultraviolet light it is exposed to. Fluorite occurs commonly in cubic, octahedral and dodecahedral crystals
in many different colors. These colors range from colorless and completely transparent to yellow, green, blue, purple, pink or black. Purples and greens tend to be the most common colors seen.