mineral

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Hardness: 4. Color: Varied bands of purple, green, and clear. Luster: Vitreous/glassy. Crystal structure: Isometric (often cubic or octahedral). Cleavage: Perfect octahedral.

Hardness: 4
Color: Varied bands of purple, green, and clear
Luster: Vitreous/glassy

Identified July 6, 2026More mineral →

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Physical properties

Hardness: 4. Color: Varied bands of purple, green, and clear. Luster: Vitreous/glassy. Crystal structure: Isometric (often cubic or octahedral). Cleavage: Perfect octahedral.

Formation & geological history

Commonly forms as a hydrothermal mineral in veins, often associated with metallic ores. It can form in various geological environments from sedimentary to igneous cavities.

Uses & applications

Mainly used as a flux in steel making, in the manufacture of glass and enamels, and as a popular gemstone for decorative carvings and jewelry.

Geological facts

Fluorite was the original mineral used to describe the phenomenon of fluorescence; many specimens glow under UV light. It is often called 'the most colorful mineral in the world.'

Field identification & locations

Identified by its specific hardness (can be scratched by a knife but not a penny) and its distinct colored banding. Common locations include China, Mexico, and the USA (Illinois).