Fluorite
Fluorite (Calcium Fluoride) · Semi-Precious Gemstone / Mineral Specimen / Decorative Stone
Crystal System
Cubic (Isometric); commonly found as cubes or octahedrons; this specimen is carved into a crescent moon shape.
Mineral Group
Halides
Chemical Formula
CaF2 (Calcium Fluoride) with possible trace elements like rare earth elements (REEs) contributing to the purple and green bands.
Formation Process
Hydrothermal; forms from the precipitation of mineral-rich hot fluids in veins and cavities, often associated with metallic minerals.
About This Crystal
A carved crescent moon displaying distinct color zoning with bands of pale green and light purple (lavender). The specimen is translucent to transparent with a vitreous (glass-like) luster and internal cleavage planes visible.
Physical Characteristics
Color: Banded green and purple; Streak: White; Cleavage: Perfect octahedral in four directions; Fracture: Subconchoidal to uneven; Specific Gravity: 3.18; Fluorescence: Strong blue-violet under UV light.
Optical Properties
Refractive Index: 1.434 (Singly Refractive); Birefringence: None (Isotropic); Pleochroism: None; Optical Phenomena: Fluorescence (the term originated from this mineral).
Hardness & Durability
Origin Region
Major sources include China, Mexico, Brazil, and Illinois (USA). Typically forms in hydrothermal veins and sedimentary deposits.
Hardness & Durability
Mohs Hardness: 4 (Reference mineral for 4); Toughness: Brittle; Cleavage makes it prone to splitting; low durability for high-impact jewelry.
Care & Maintenance
Avoid ultrasonic cleaners and steam. Clean with warm soapy water and a soft cloth. Keep away from sunlight to prevent fading and store separately from harder stones like quartz to avoid scratches.
Rarity & Value
Common; Value is determined by color saturation and intensity of banding. Carvings like this are generally affordable ($5-$20 range). Rarely treated, though some may be irradiated.
Special Characteristics
Displays prominent color banding which corresponds to changes in the chemical environment during growth. Exhibits strong fluorescence and sometimes thermoluminescence.
Lore & History
Historically used by ancient Egyptians for statues and Romans for decorative cups. In metaphysical traditions, it is known as the 'Genius Stone,' associated with mental clarity, focus, and organizing the mind.