Weekly Gemstone - Fluorite

What it is

• Fluorite is a colorful mineral composed of calcium fluoride (CaF2). It forms in cubic or octahedral crystals and is prized for its vibrant hues and clarity.

• Common colors: purple, green, blue, yellow, pink, and colorless. Bands or zones of multiple colors often appear in a single specimen.

• Fluorite is fluorescent under ultraviolet light—this property gave the mineral its name.

Where it’s found

• Major deposits: China, Mexico, South Africa, Spain, and parts of the United States (Illinois, Kentucky, Colorado, New Mexico).

• Often associated with hydrothermal veins, pegmatites, and sedimentary deposits.

Physical properties

• Hardness: 4 on the Mohs scale (relatively soft; can be scratched by a steel knife).

• Cleavage: perfect octahedral cleavage—breaks along smooth planes.

• Specific gravity: about 3.0–3.3.

• Luster: vitreous (glass-like).

Uses

• Industrial: source of fluorine for hydrofluoric acid and as a flux in steelmaking and smelting.

• Optical: high-quality fluorite is used for lenses and optical components because of low dispersion.

• Gem and decorative: cut into cabochons, beads, carvings, and collectors’ crystals.

• Metaphysical/collecting: valued for its range of colors and believed (by some) to enhance clarity, focus, and psychic development.

Care and handling

• Avoid exposure to acids and prolonged sunlight (some specimens can fade).

• Clean gently with mild soap and water; avoid ultrasonic cleaners and harsh chemicals.

• Because of perfect cleavage and low hardness, handle with care to prevent chips and fractures.

Buying tips

• Check for color consistency, clarity, and intact crystal faces.

• Be aware of enhanced or dyed pieces—ask sellers about treatments.

• For jewelry, choose protective settings (bezel or halo) to shield the stone from knocks.

Why collectors love it

• Striking colors and fluorescence make fluorite one of the most visually appealing minerals.

• Wide variety of crystal habits and zoning creates unique specimens.

• Accessible price range—from affordable hobby pieces to high-end collector-grade crystals.