Fluorite
Fluorite · Mineral Specimen and Semi-Precious Stone
Crystal System
Cubic system, typically forms cubic, octahedral, or dodecahedral crystals, as well as massive, granular, or columnar habits. Often exhibits interpenetrant twinning.
Mineral Group
Halides
Chemical Formula
CaF2
Formation Process
Hydrothermal process, forming from mineral-rich fluids in rock cavities and veins at low to moderate temperatures, often associated with metallic ore deposits like lead and zinc.
About This Crystal
The specimen is a polished, blocky piece of fluorite displaying a striking combination of translucent green and deep purple color zoning. It has a vitreous luster, smooth tactile surfaces with polished edges, and internal fracture lines typical of its cleavage planes.
Physical Characteristics
Color ranges across green, purple, blue, and clear; white streak; perfect octahedral cleavage in four directions; conchoidal to uneven fracture; specific gravity of approximately 3.18; brittle tenacity; often exhibits strong blue or violet fluorescence under UV light.
Optical Properties
Isotropic with a refractive index of approximately 1.434. It has low relief, no birefringence, and no pleochroism due to its isometric crystal system.
Hardness & Durability
Origin Region
Found globally with notable deposits in China, Mexico, South Africa, the UK, and the USA. It typically occurs as a common gangue mineral in hydrothermal ore veins.
Hardness & Durability
Mohs hardness of 4, making it relatively soft and easily scratched. It has poor durability for daily wear jewelry due to its low hardness and perfect cleavage, which makes it prone to splitting.
Care & Maintenance
Clean with mild soapy water and a soft cloth. Avoid ultrasonic cleaners, steam, harsh chemicals, and prolonged exposure to direct sunlight to prevent fading. Store separately from harder stones to avoid scratching.
Rarity & Value
Common mineral worldwide, though high-clarity specimens or unusual color zoning combinations can command higher prices among collectors. Treatments like heat or irradiation are rarely needed since natural colors are vibrant.
Special Characteristics
Famous for strong fluorescence under ultraviolet light (which gave the phenomenon of fluorescence its name). It also frequently exhibits strong thermoluminescence and triboluminescence.
Lore & History
Historically used for ornamental carvings and vases since ancient Roman times. In modern metaphysical practices, fluorite is considered the 'Genius Stone,' associated with mental clarity, focus, and clearing negative energy, though these are traditional beliefs rather than scientific claims.