1.9" Black Tourmaline (Schorl) Encased in Fluorite - Namibia

Here is an association of fluorite, black tourmaline (schorl) and mica, collected from the Erongo Mountains in Namibia. The deep green fluorite formed over the black tourmaline crystals. The fluorite fluoresces a white-purple color under UV lighting.

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 the most common form of tourmaline, and has been used for everything from jewelry to piezoelectric guitar pickups.
Fluorite, Black Tourmaline (Schorl) & Mica
Erongo Mountains, Namibia
1.9" long, 1.6" wide