mineral

Tumbled blue stone, likely blue aventurine or dyed quartzite

Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing

AI-generated identification · may be incorrect

Polished, opaque-to-translucent deep blue surface with vitreous luster; quartz hardness about 7 Mohs, no visible cleavage, and specific gravity near 2.65. Its rounded form is mechanically tumbled and polished.

Identified August 7, 2026More mineral →

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At a glance

Common name: Tumbled blue stone, likely blue aventurine or dyed quartzite
Scientific name: Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing
Category: mineral
Identified: August 7, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a common tumbled specimen; $20–$50 if confirmed as attractive natural blue quartz or aventurine.

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

If natural blue aventurine/quartzite, it formed from silica-rich fluids or metamorphosed quartz-bearing rock; geological age depends on locality. Strong uniform color may indicate dyeing or surface treatment.

Uses & applications

Commonly sold as a worry stone, lapidary cabochon, decorative object, or inexpensive collectible; not typically used in construction.

Geological facts

Blue quartz is uncommon, while commercially sold blue tumbled stones are often dyed quartzite, aventurine, or glass. A magnifier may reveal mica or hematite inclusions in natural aventurine.

Field identification & locations

Check for granular quartz texture, tiny reflective mica flakes, uneven dye concentration, and scratches that do not easily mark the surface. Common sources include Brazil, India, and Madagascar; hardness and streak tests help distinguish it from glass.