mineral

Tumbled green aventurine (probable), with blue-gray tumbled stones

Aventurine quartz, SiO₂ with fuchsite or other mica inclusions; blue stones may be sodalite or dyed quartz

AI-generated identification · may be incorrect

The prominent green stone is translucent to opaque, glossy, and smoothly tumbled, with quartz hardness about 7 Mohs and no obvious cleavage; aventurine commonly shows sparkling mica. Exact identification of the blue stones requires testing, as color and lighting are insufficient.

Identified September 8, 2026More mineral →

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At a glance

Common name: Tumbled green aventurine (probable), with blue-gray tumbled stones
Scientific name: Aventurine quartz, SiO₂ with fuchsite or other mica inclusions; blue stones may be sodalite or dyed quartz
Category: mineral
Identified: September 8, 2026
Method: Standard

AI Estimated Value

About $2–$15 for the pictured tumbled stones; larger attractive pieces or quality cabochons may sell for $10–$50.

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

Aventurine forms when quartz crystallizes with disseminated mica or other mineral inclusions, commonly in metamorphic or hydrothermal settings; specimens may be geologically ancient, with age dependent on their host rock.

Uses & applications

Used as inexpensive lapidary material, beads, carvings, cabochons, and decorative stones; not generally used as a major construction aggregate.

Geological facts

Green aventurine’s shimmer is called aventurescence and is usually caused by fuchsite mica. It is commonly confused with green glass or jade, but quartz hardness and mica sparkle are useful clues.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Check for natural mica glitter, quartz-like hardness, and lack of bubbles; a gemological test is needed to distinguish the blue pieces and confirm the green specimen.