Fluorite
Fluorite (IMA-approved), CaF2 · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Cubic (Isometric). Typically occurs in cubes or octahedrons. This specimen is a polished teardrop-shaped cabochon with internal cleavage planes apparent.
Mineral Group
Halides
Chemical Formula
CaF2 (Calcium Fluoride). Color variations often caused by trace elements or radiation-induced color centers (F-centers).
Formation Process
Hydrothermal; forms from the circulation of fluorine-bearing fluids in high-temperature environments, often alongside galena, sphalerite, and quartz.
About This Crystal
Polished purple fluorite cabochon, approximately 3cm in length. Displays characteristic translucent to transparent clarity with distinctive 'chevron' or 'zigzag' color zoning and white inclusions following internal cleavage planes.
Physical Characteristics
Color: Purple/Violet with white zoning. Streak: White. Cleavage: Perfect octahedral (four directions). Fracture: Subconchoidal to uneven. Specific Gravity: 3.175–3.184. Very brittle. Strong fluorescence under UV light is common (blue-violet).
Optical Properties
Refractive Index: 1.433 (Singly refractive). Luster: Vitreous (glass-like). Dispersion: Low. Often shows color zoning related to environmental changes during growth.
Hardness & Durability
Origin Region
Major sources include China, Mexico, South Africa, and the United Kingdom (notably Blue John). Found in hydrothermal veins and sedimentary deposits.
Hardness & Durability
Mohs Hardness: 4. Low durability; very scratch-prone. Brittle tenacity makes it sensitive to pressure. Not recommended for rings; best for pendants/earrings.
Care & Maintenance
Clean with warm soapy water only. Avoid ultrasonic cleaners, steam, and harsh chemicals. Store separately from harder stones (like quartz). Sensitive to heat and prolonged sunlight, which may cause fading.
Rarity & Value
Common mineral. Value is determined by color intensity, clarity, and zoning patterns. Large, flawless pieces or rare colors (pink, blue) fetch higher prices.
Special Characteristics
Displays prominent internal color zoning and phantom-like white patterns. Named for its property of fluorescence; many specimens glow brightly under ultraviolet light.
Lore & History
Historically used by ancient Egyptians for statues and the Romans for decorative cups. Traditional lore associates it with mental clarity, focus, and the throat or third eye chakras (purple variety).