mineral

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Hardness: 4 on Mohs scale; Color: Multi-colored bands of purple, green, and blue; Luster: Vitreous (glassy); Crystal structure: Isometric (cubic/octahedral); Cleavage: Perfect octahedral in four directions; Specific gravity: 3.175 to 3.184.

Hardness: 4 on Mohs scale
Color: Multi-colored bands of purple, green, and blue
Luster: Vitreous (glassy)

Identified March 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity in veins where low-temperature mineralizing solutions have permeated rocks. It is commonly found in sedimentary rocks such as limestones and dolomites, as well as igneous environments like pegmatites.

Uses & applications

Used primarily as a flux in steel making and aluminum production. High-clarity specimens are used for special camera lenses and telescopes. It is highly popular in lapidary for decorative spheres, carvings, and as a semi-precious collector stone.

Geological facts

Fluorite is the origin of the term 'fluorescence' because many specimens glow under UV light. It is often called 'the most colorful mineral in the world' due to the wide variety of trace element impurities that create its rainbow hues.

Field identification & locations

Identify in the field by its distinct color banding, relative softness (can be scratched by a knife but not a copper penny easily), and octahedral cleavage. Common locations include China, Mexico, South Africa, and the Illinois-Kentucky district in the USA.