2.8" Purple Fluorite on Quartz Epimorphs - Arizona
Here is a beautiful 2.8" wide cluster of purple fluorite crystals that formed on quartz epimorphs after calcite. This specimen was collected from the La Fluorita Dulcita Cu prospect in Cochise County, Arizona. Under short wave UV, the fluorite fluoresces purple in color, while any calcite will fluoresce a faint orange.
Fluorite 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.