Chemical Formula CaF2
Color White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Black, Banded, Multicolored
Crystal System Isometric
Refractive Index .434
SG 3.0 – 3.3
Transparency Transparent to translucent
Double Refraction None
Cleavage 1, all sides
Mineral Class Fluorite
Most Fluorite gemstones are from deeply colored stones, but they can also be cut from the less intense color forms. The most popular color for Fluorite is purple, and deep purple Fluorite can closely resemble Amethyst. Fluorite is often brightly fluorescent in ultraviolet light. In fact, the term fluorescence is derived from Fluorite. Due to the very low hardness and perfect cleavage of Fluorite, special care must be taken to ensure it doesn’t get scratched or chipped.
Fluorite is not commonly used as jewelry, and is cut mostly for collectors. Small varicolored beads of Fluorite are sometimes strung for use as a bracelet. Fairly large gemstones have been cut from Fluorite, and round cuts with concave patterns are typical. Banded and multicolored Fluorites are sometimes cut and polished as cabochons. The banded variety Blue John was once used for ornamental carvings and as goblets.
Blue John – Banded purple and white (or purple and yellow) variety of Fluorite sometimes used for ornamental purposes.Fluorite is generally not heated or enhanced, though it has been occasionally irradiated to achieve wild neon colors.Fluorite is very common and deposits are found worldwide in almost all countries. Specifically famous producers include Canada, China, England, France, India, Mexico, Morocco, Namibia, Russia, South Africa Spain, Switzerland and the United States (especially Colorado, Ohio, Illinois, Kentucky, Tennessee, New Hampshire, and New Mexico).SIMILAR GEMSTONES The properties below are generic to all Garnets; see the specific Garnet gemstone pages for more precise details.
Garnet is not a single mineral, but describes a group of several closely related minerals. Garnets come in a variety of colors and have many different varieties. However, the most widely-known color of Garnet gemstones is dark red. When the term “Garnet” is used, it is usually connotative of the dark red form; other color Garnets are usually given more descriptive gemstone terms.
Due to the color variation of Fluorite, it can resemble many gemstones, though it can be easily distinguished by its low hardness.
The banded variety Blue John comes from Derbyshire, England.
Fluorite TREATMENTS AND ENHANCEMENTS