3.9" Large Green Fluorite Crystals over Schorl - Namibia

Here is an association of green fluorite and black tourmaline (schorl), collected from the Erongo Mountains in Namibia. The fluorite crystal formed over a black tourmaline (schorl) crystal. The underside of the specimen exhibits some nice acicular schorl within the fluorite; a nice bonus to the overall aesthetics. The fluorite doesn't fluoresce, however under short wave UV, the white mineral coating part of the fluorite fluoresces a vibrant yellow-green 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.

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

Fluorite & Black Tourmaline (Schorl)
Erongo Mountains, Namibia
3.9 x 3.1"