Green Fluorite
Fluorite (IMA-approved mineral name) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Cubic (Isometric); commonly found in cubes or octahedrons; often occurs as massive or granular habits.
Mineral Group
Halides
Chemical Formula
CaF2 (Calcium Fluoride), with trace Rare Earth Elements (REE) often providing the green coloration.
Formation Process
Primarily Hydrothermal, forming from fluorine-rich fluids passing through carbonate rocks; also found as an accessory mineral in igneous rocks like pegmatites.
About This Crystal
A translucent to transparent specimen displaying a soft mint to sea-foam green color. It exhibits a vitreous (glassy) luster and shows characteristic step-like cleavage planes and internal fractures.
Physical Characteristics
Color: Green; Streak: White; Cleavage: Perfect octahedral (four directions); Fracture: Subconchoidal to uneven; Specific Gravity: 3.175–3.184; Fluorescence: Strong blue-violet under longwave UV.
Optical Properties
Isotropic (Singly Refractive); Refractive Index: 1.433–1.435; Dispersion: 0.007 (very low); lacks pleochroism due to cubic structure.
Hardness & Durability
Origin Region
Prominent sources include China, Mexico, South Africa, and the United Kingdom (notably the Durham region). It forms in hydrothermal veins and sedimentary deposits.
Hardness & Durability
Mohs Hardness: 4 (Defining mineral for 4 on the scale). Fragile toughness; sensitive to heat and pressure with easy cleavage that makes it risky for rings.
Care & Maintenance
Clean with warm, soapy water only; avoid ultrasonic and steam cleaners. Store separately from harder stones like quartz to prevent scratching. Avoid prolonged sunlight as color may fade.
Rarity & Value
Relatively common mineral; value is determined by color intensity, transparency, and crystal size. Generally affordable, though exceptionally clear or uniquely shaped specimens command higher prices.
Special Characteristics
The mineral gave its name to the phenomenon of 'fluorescence.' Some green varieties may exhibit thermoluminescence (glowing when heated).
Lore & History
Historically used by Ancient Egyptians and Romans for carved vessels and jewelry. In modern lore, green fluorite is associated with the Heart Chakra and is believed to aid in mental clarity and emotional renewal.