4.1" Large Green Fluorite Crystals over Schorl - Namibia

Large Green Fluorite Crystals over Schorl - Namibia #169369

Here is an association of fluorite and black tourmaline (schorl), collected from the Erongo Mountains in Namibia. The fluorite crystal formed over a black tourmaline (schorl) crystal. The fluorite doesn't fluoresce, however under short wave UV, the white mineral along one edge of the fluorite fluoresces a vibrant yellow-green color.

About Fluorite

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, and colorless, pink, and black are the rarest.

Tourmaline is a crystalline boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Schorl, or black tourmaline, is its most common form, and has been used for everything from jewelry to piezoelectric guitar pickups.

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