Fluorite
Fluorite (Calcium Fluoride) · Semi-Precious Gemstone / Collector Mineral / Decorative Stone
Crystal System
Cubic (Isometric); typically forms as cubic or octahedral crystals, though this specimen is carved into a heart shape. It displays perfect octahedral cleavage in four directions.
Mineral Group
Halides; specifically the Halide mineral class (main source of Fluorine).
Chemical Formula
CaF2 (Calcium Fluoride), often with trace rare-earth elements (REE) like Yttrium or Cerium contributing to color zoning.
Formation Process
Hydrothermal; forms via the precipitation of calcium-rich fluids and fluorine gas or liquid in veins, often associated with lead and zinc ores or in limestone cavities.
About This Crystal
This specimen is a carved, polished heart measuring approximately 5cm in width. It displays characteristic color zoning with bands of translucent teal-green, purple, and colorless areas. It has a vitreous (glassy) luster and visible internal cleavage planes and fractures.
Physical Characteristics
Color: Multicolored (Rainbow) with green, purple, and clear bands; Streak: White; Cleavage: Perfect octahedral {111}; Fracture: Subconchoidal to uneven; Specific Gravity: 3.18; Fluorescence: Strong blue-violet under UV light (usually).
Optical Properties
Refractive Index: 1.434 (Singly Refractive); Birefringence: None (Isotropic); Pleochroism: None. It is highly transparent to translucent with a vitreous surface reflection.
Hardness & Durability
Origin Region
Notable sources include China, Mexico, England (Blue John), and Illinois, USA. Typically found in hydrothermal veins and sedimentary deposits.
Hardness & Durability
Mohs Hardness: 4. It is relatively soft and brittle. It is susceptible to scratching and can easily cleave or shatter if hit or dropped. Not recommended for high-wear jewelry like rings.
Care & Maintenance
Clean only with warm soapy water and a soft cloth; avoid ultrasonic cleaners and steam. Keep away from acids and prolonged direct sunlight, which can fade the purple hues. Store separately from harder stones like quartz to prevent scratches.
Rarity & Value
Common; very affordable as a decorative stone. Value is determined by color intensity, size, and the quality of the carving. Often untreated, though occasionally irradiated to enhance color.
Special Characteristics
Displays prominent color zoning (rainbow effect) caused by changes in impurities during growth. Named for its property of fluorescence; many specimens glow under UV light.
Lore & History
Historically used by ancient Egyptians and Romans for vessels and amulets. In modern crystal healing lore, it is referred to as the 'Genius Stone,' associated with mental clarity, focus, and the heart and third eye chakras.