Fluorite
Fluorite · Collector Mineral and Semi-Precious Gemstone; also a vital Industrial Mineral.
Crystal System
Cubic (Isometric); commonly occurring as cubes, octahedrons, or massive granular forms; penetrative twinning is frequent.
Mineral Group
Halides; purely composed of calcium and fluorine.
Chemical Formula
CaF2 (Calcium Fluoride) with trace elements like Yttrium or Cerium often affecting color.
Formation Process
Hydrothermal; it precipitates from hot, mineral-rich fluids circulating through fractures in the earth's crust, often associated with lead and zinc ores.
About This Crystal
Transparent to translucent specimen showing pale green and colorless zones. It displays a characteristic vitreous luster with distinct cubic planes and step-like cleavage growth.
Physical Characteristics
Color: Pale green, white, or colorless; Streak: White; Cleavage: Perfect octahedral in four directions; Specific Gravity: 3.18; Fluorescence: Strongly fluorescent under UV light.
Optical Properties
Isotropic (Singly Refractive) with a low refractive index of approximately 1.434. It lacks pleochroism and has low dispersion.
Hardness & Durability
Origin Region
Madagascar, China, Mexico, England (Blue John), and the United States (Illinois/Kentucky district). Forms in hydrothermal veins and carbonate rocks.
Hardness & Durability
Mohs Hardness: 4 (defining mineral for 4); Brittle tenacity with very poor wearability for jewelry due to soft nature and perfect cleavage.
Care & Maintenance
Clean only with warm, soapy water; avoid ultrasonics, steam, and acids. Store away from harder stones to prevent scratching and avoid prolonged sunlight exposure to prevent fading.
Rarity & Value
Common globally but high-quality large crystals are valued by collectors. Generally affordable, though rare colors or localities (like English Blue John) command higher prices.
Special Characteristics
Displays strong fluorescence (named after the mineral); can exhibit color zoning (phantoms) and thermoluminescence if heated.
Lore & History
Historically used by ancient Egyptians and Romans for vessels and amulets. In modern lore, it is referred to as the 'Genius Stone,' associated with mental clarity, focus, and the heart/third eye chakras.