3.6" Green, Fluorescent, Cubic Fluorite Crystals - Madagascar
This emerald-green, cubic fluorite crystal cluster comes from Mandrosonoro, Madagascar. The crystals bear a vibrant blue-purple fluorescence under shortwave UV. There is some faint fluorescence under longwave UV as well.
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, with colorless, pink, and black being the rarest.
Mandrosonoro, Ambatofinandrahana, Madagascar
3.6 x 3.1"