3" Purple Edge Fluorite Crystal Cluster - Qinglong Mine, China
This is a gorgeous, 3" wide cluster of green cubic fluorite crystals with white phantoms and purple edges that formed from a quartz crystal encrusted matrix. It comes from the Qinglong Mine (Dachang Mine) in the Guizhou Province of China, a mine known for the interesting fluorite crystals it produces. Under shortwave UV, the green cores of these fluorite crystals fluoresce a purple color.
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.