mineral

Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite

Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain

AI-generated identification · may be incorrect

Blue-green, translucent to opaque, with a glassy-to-waxy luster and irregular internal mottling; likely Mohs hardness 5–5.5 if apatite. Tumbled polishing obscures crystal shape and cleavage.

Identified August 11, 2026More mineral →

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At a glance

Common name: Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite
Scientific name: Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain
Category: mineral
Identified: August 11, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a small common tumbled specimen; attractive natural blue pieces may sell for $20–$100.

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

Blue-green, translucent to opaque, with a glassy-to-waxy luster and irregular internal mottling; likely Mohs hardness 5–5.5 if apatite. Tumbled polishing obscures crystal shape and cleavage.

Formation & geological history

Apatite commonly crystallizes in granite pegmatites, alkaline igneous rocks, and metamorphic deposits during late-stage magmatic or hydrothermal activity. Its age varies with the host rock, commonly millions to billions of years.

Uses & applications

Used mainly as a lapidary or mineral-collection material; apatite is also an important phosphate ore for fertilizer, though this small polished piece has no industrial value.

Geological facts

The intense blue color may reflect trace rare-earth elements or impurities. Similar-looking materials include aquamarine, blue fluorite, kyanite, and dyed quartz.

Field identification & locations

Check hardness, streak, transparency, and specific gravity; laboratory testing or microscopy is needed for confident identification. Blue apatite is found notably in Brazil, Madagascar, Mexico, and Norway.