Green Fluorite
Fluorite (Fluorit) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Cubic (Isometric); typically forms cubic, octahedral, or dodecahedral crystals. This specimen appears massive or cleaved with internal fractures along octahedral planes.
Mineral Group
Halides
Chemical Formula
CaF2 (Calcium Fluoride)
Formation Process
Hydrothermal; it precipitates from circulating hot fluids in volcanic or sedimentary rocks, often occurring alongside lead and silver ores.
About This Crystal
Translucent to transparent pale green body color. It displays a vitreous luster and characteristic octahedral cleavage. Internal visible fractures and white veining are present, giving it a slightly cloudy appearance in parts.
Physical Characteristics
Color: Mint green; Streak: White; Cleavage: Perfect octahedral (4 directions); Fracture: Subconchoidal to uneven; Specific Gravity: 3.1 to 3.3. It often fluoresces bright blue or violet under UV light.
Optical Properties
Refractive Index: 1.434 (Singly refractive); Birefringence: None (isotropic); Dispersion: Very low (0.007). Occasionally exhibits thermoluminescence.
Hardness & Durability
Origin Region
Major sources include China, Mexico, South Africa, and the United States (Illinois/Kentucky). Forms in hydrothermal veins and sedimentary environments.
Hardness & Durability
Mohs Hardness: 4. It is quite soft and brittle, making it susceptible to scratching and breakage. Low toughness due to perfect cleavage.
Care & Maintenance
Avoid ultrasonic cleaners and steam. Clean with warm, soapy water and a soft cloth. Store separately from harder minerals like quartz to avoid scratches. Keep away from prolonged direct sunlight to prevent fading.
Rarity & Value
Common; relatively affordable. Value is determined by color intensity, transparency, and crystal formation. Highly priced specimens feature sharp, undamaged cubic crystals.
Special Characteristics
Strong fluorescence is a hallmark of the species (the word fluorescence is derived from fluorite). It also exhibits perfect octahedral cleavage, which allows it to be split into eight-sided diamond shapes.
Lore & History
Historically used by ancient Egyptians for statues and the Chinese for intricate carvings. In modern lore, it is associated with focus, mental clarity, and the heart chakra.