mineral

Green glassy mineral specimen, likely chromium-bearing fluorite (tentative)

Fluorite, CaF₂, possibly green fluorite; identification uncertain from image

AI-generated identification · may be incorrect

Vivid translucent emerald-green color, vitreous luster, irregular fracture and apparently cubic cleavage; fluorite has Mohs hardness 4 and specific gravity about 3.18. The intense glow could also indicate a polished glass imitation or another green gemstone, so hardness and refractive tests are needed.

Identified August 14, 2026More mineral →

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At a glance

Common name: Green glassy mineral specimen, likely chromium-bearing fluorite (tentative)
Scientific name: Fluorite, CaF₂, possibly green fluorite; identification uncertain from image
Category: mineral
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a small common polished fluorite; $50–$300+ for unusually transparent, vivid specimens. If glass, typically under $10.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Green fluorite forms in hydrothermal veins and carbonate-hosted deposits, commonly with quartz, calcite, and sulfides; deposits are generally Phanerozoic. Around 20.1°S, 42.0°W (Minas Gerais, Brazil), diverse hydrothermal minerals and gemstones occur, but this exact identification cannot be confirmed visually.

Uses & applications

Fluorite is used as a flux in steelmaking and as a fluorine source; transparent colorful pieces are cut or sold as cabinet specimens. Common-quality pieces are inexpensive, while exceptionally saturated, transparent material is collectible.

Geological facts

The specimen’s rounded, highly polished-looking form and intense uniform green strongly resemble a cut/tumbled commercial specimen rather than an identifiable raw outcrop sample. Green fluorite may fluoresce under ultraviolet light, though response varies.

Field identification & locations

Check for true cubic cleavage, a glass-scratching test (fluorite should not scratch ordinary glass), and specific gravity; a gemologist can distinguish it from green glass, diopside, emerald, or chrome tourmaline. Common fluorite sources include China, Mexico, England, and the United States.