mineral

Blue polished/tumbled stone, likely blue apatite or dyed quartz

Apatite-group mineral, commonly fluorapatite (Ca5(PO4)3F); exact identification requires testing

AI-generated identification · may be incorrect

Opaque-to-translucent blue, vitreous-to-waxy luster, rounded tumbled form, and no visible cleavage. Apatite has Mohs hardness 5; dyed quartz would be harder at 7, so a scratch test can distinguish them.

Identified September 21, 2026More mineral →

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At a glance

Common name: Blue polished/tumbled stone, likely blue apatite or dyed quartz
Scientific name: Apatite-group mineral, commonly fluorapatite (Ca5(PO4)3F); exact identification requires testing
Category: mineral
Identified: September 21, 2026
Method: Standard

AI Estimated Value

Approximately $5-$25 for a common tumbled or treated stone; $25-$100+ for attractive, verified natural blue apatite.

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

Natural blue apatite forms in igneous and metamorphic rocks through hydrothermal or magmatic processes; quartz forms in veins and cavities. Geological ages vary widely, from Precambrian to recent deposits.

Uses & applications

Used mainly as a lapidary and collector stone; apatite is also an important phosphate ore, while quartz is used in glass, electronics, and abrasives.

Geological facts

The intense, fairly uniform blue color may indicate dyeing or surface treatment, and the photograph alone cannot confirm species or treatment.

Field identification & locations

Common sources of blue apatite include Brazil, Madagascar, Mexico, and Canada; blue quartz and dyed stones are more widespread. Check hardness, streak, specific gravity, and fluorescence, or use Raman/XRF testing for reliable identification.