mineral

Fluorescent sodalite (hackmanite), likely a polished or tumbled specimen

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; hackmanite is a sulfur-bearing variety

AI-generated identification · may be incorrect

Blue-green fluorescence under ultraviolet light is visible; sodalite is typically blue with white veining, vitreous to greasy luster, and Mohs hardness 5.5–6. It has a cubic crystal structure and poor cleavage; the image alone cannot confirm the material or variety.

Identified October 7, 2026More mineral →

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At a glance

Common name: Fluorescent sodalite (hackmanite), likely a polished or tumbled specimen
Scientific name: Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; hackmanite is a sulfur-bearing variety
Category: mineral
Identified: October 7, 2026
Method: Standard

AI Estimated Value

About $2–$20 for a small common polished specimen; more for larger, well-formed or strongly fluorescent material.

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

Sodalite crystallizes in silica-poor igneous rocks, especially nepheline syenites; deposits formed at various geological ages. Hackmanite’s UV response is associated with trace impurities and defects in its crystal structure.

Uses & applications

Used as an ornamental stone, in carvings and jewelry, and as a mineral specimen; softer than many gemstones, so it is best protected from scratching.

Geological facts

Some sodalite fluoresces orange or pink under UV, while hackmanite can show reversible color change (tenebrescence). The strong cyan glow here may also come from another fluorescent mineral or a treated material.

Field identification & locations

Check for blue body color, white veining, and hardness near 5.5–6; a gemological test is needed for reliable identification. Sodalite occurs in Canada, Brazil, Greenland, and Namibia.