2.65" Botryoidal Fluorite on Amethyst - Colorado

This is a unique formation of layers of purple-green botryoidal fluorite between a cluster of lustrous, pale purple amethyst. It's old stock material that came out of the Nancy Hanks mine in Mesa County, Colorado, collected when the mine was still in operation.

The fluorite exhibits a stunning blue-purple fluorescence under shortwave ultraviolet light.

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.
Fluorite & Quartz var. Amethyst
Nancy Hanks Mine, Unaweep Mining District, Mesa County, Colorado
Entire specimen: 2.65 x 2.05"