mineral

Likely fluorite crystal fragment

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Small translucent blue-gray crystal with a glassy luster and blocky shape, suggestive of fluorite’s cubic cleavage. Fluorite has Mohs hardness 4; its crystal system is cubic and specific gravity is about 3.2.

Identified September 29, 2026More mineral →

Explore Likely fluorite crystal fragment in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Fluorite commonly crystallizes from hot, mineral-rich fluids in hydrothermal veins and cavities, often alongside calcite and quartz. Such deposits formed in many geological periods; age and locality cannot be determined from the image.

Uses & applications

Used as an industrial source of fluorine and in optical applications; attractive crystals are collected, while gem-quality fluorite is sometimes cut for jewelry but is relatively soft.

Geological facts

Fluorite can occur in many colors and may fluoresce under ultraviolet light; the mineral name is the source of the word “fluorescence.”

Field identification & locations

The apparent blocky cleavage and blue-gray color fit fluorite, but the photo alone cannot confirm it; a hardness or diagnostic test and locality would help. Common deposits occur in China, Mexico, South Africa, and the United States.