mineral

Tumbled blue stone, likely blue aventurine or dyed quartz

Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing

AI-generated identification · may be incorrect

Small polished/tumbled piece with dark blue-gray color, subtle speckling, and vitreous-to-waxy luster. Quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; dyeing or another mineral is possible.

Identified August 13, 2026More mineral →

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At a glance

Common name: Tumbled blue stone, likely blue aventurine or dyed quartz
Scientific name: Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing
Category: mineral
Identified: August 13, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 for a small tumbled piece; $10–$30 if confirmed natural blue aventurine or a notable inclusion pattern.

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 aventurine, it formed when silica-rich fluids crystallized quartz with microscopic inclusions, commonly in veins or metamorphic rocks. The specimen’s geological age and treatment cannot be determined from the image.

Uses & applications

Used mainly as a pocket stone, ornamental pebble, or inexpensive jewelry material; quartz-rich material can also be used decoratively and industrially.

Geological facts

Blue aventurine is less common than green or orange aventurine, while dyed quartz and blue glass are frequent substitutes in commercial tumbles.

Field identification & locations

Quartz should scratch glass but not be scratched by a steel knife; glassy translucence, irregular inclusions, and lack of bubbles support quartz. Common sources include Brazil, India, Russia, and Madagascar; visual identification alone is uncertain.