mineral

Blue-green fluorite (probable)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Translucent turquoise-blue rough crystal with vitreous luster and likely cubic cleavage; Mohs hardness 4, specific gravity about 3.18. The irregular shape and visible internal planes are consistent with fractured fluorite, though color alone is not diagnostic.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Fluorite forms mainly in hydrothermal veins and cavities, commonly with quartz, calcite, barite, or lead-zinc ores; specimens range from ancient to modern geological ages. Common sources include China, Mexico, England, the United States, and Morocco.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; attractive crystals are collected and occasionally cut as gemstones, though fluorite is relatively soft.

Geological facts

Blue-green fluorite can show zoning or color bands and may fluoresce under ultraviolet light. It should not be confused with turquoise, glass, or blue calcite without hardness, cleavage, and density tests.

Field identification & locations

Look for cubic crystal faces or perfect octahedral cleavage, glassy luster, and easy scratching with a steel knife; fluorite does not scratch glass reliably. The photograph supports a probable identification, but a crystal-face view or testing is needed for certainty.