mineral

Purple Fluorite Octahedron

Fluorite (Calcium Fluoride, CaF2)

AI-generated identification · may be incorrect

Hardness: 4 on Mohs scale; Color: Purple/Violet; Luster: Vitreous (glassy); Crystal Structure: Isometric/Cubic (cleaved into octahedrons); Cleavage: Perfect octahedral; Specific Gravity: 3.175-3.184.

Hardness: 4 on Mohs scale
Color: Purple/Violet
Luster: Vitreous (glassy)

Identified July 8, 2026More mineral →

Explore Purple Fluorite Octahedron in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 4 on Mohs scale; Color: Purple/Violet; Luster: Vitreous (glassy); Crystal Structure: Isometric/Cubic (cleaved into octahedrons); Cleavage: Perfect octahedral; Specific Gravity: 3.175-3.184.

Formation & geological history

Formed in hydrothermal veins, often associated with lead and zinc ores in limestone or as an accessory mineral in granites and pegmatites. These octahedron shapes are often created by masterfully cleaving larger cubes along their natural crystal planes.

Uses & applications

Used as a flux in steel making, in the manufacture of opalescent glass, as enamels for cooking utensils, and highly valued as a collectible mineral or decorative gemstone.

Geological facts

Fluorite was named the official state mineral of Illinois in 1965. It is known as 'the most colorful mineral in the world' and the word 'fluorescence' is derived from it because many specimens glow under UV light.

Field identification & locations

Can be identified in the field by its distinct 4-directional cleavage and its inability to scratch glass but its ability to be scratched by a knife. Common locations include China, Mexico, and the Hardin County area in Illinois, USA.