Yellow Fluorite
Fluorite (IMA: Fluorite) · Semi-Precious Gemstone / Collector Mineral
Crystal System
Cubic (Isometric); typical habits include cubes, octahedrons, and massive formations; this specimen is polished into a heart shape.
Mineral Group
Halides
Chemical Formula
CaF2 (Calcium Fluoride), with trace Rare Earth Elements (REE) influencing color
Formation Process
Hydrothermal; forms through the circulation of fluorine-bearing fluids in igneous and metamorphic rocks, or by precipitation in sedimentary limestone environments.
About This Crystal
A translucent to transparent yellow-to-honey colored specimen polished into a heart. It exhibits distinct color zoning or bands of deeper amber-brown across the center. The luster is vitreous (glassy) with a smooth, polished surface.
Physical Characteristics
Color: Yellow to honey-gold; Streak: White; Cleavage: Perfect octahedral in four directions; Fracture: Splintery to subconchoidal; Specific Gravity: 3.1; Fluorescence: Often strong blue or purple under Long-Wave UV light.
Optical Properties
Refractive Index: 1.433 (singly refractive); Birefringence: None (isotropic); Dispersion: Low; Phenomenon: Often exhibits strong fluorescence due to trace yttrium or europium.
Hardness & Durability
Origin Region
Prominent sources include Mexico (Durango), UK (Durham), China, and Morocco; typically found in hydrothermal veins and sedimentary deposits.
Hardness & Durability
Mohs Hardness: 4 (Reference mineral for 4); Toughness: Low/Brittle; cleavage makes it prone to cracking if struck. Poor durability for daily jewelry like rings.
Care & Maintenance
Avoid ultrasonic cleaners and steam; clean with warm soapy water and a soft cloth. Store separately from harder stones like quartz to prevent scratches. Sensitive to heat and acidic chemicals.
Rarity & Value
Common; Yellow is less common than purple or green but widely available. Value is determined by clarity and intensity of color. Treatments like irradiation are possible but yellow is usually natural.
Special Characteristics
Strongly fluorescent; this specimen shows linear color banding (zoning) which represents different stages of growth and chemical composition changes during formation.
Lore & History
Historically used by ancient Romans for drinking vessels (Murrhine cups). Metaphysically, yellow fluorite is traditionally associated with the Solar Plexus chakra, believed to enhance focus, creativity, and collective energy.