mineral

Likely polished green aventurine or serpentine pebble

Quartz-rich aventurine (SiO₂) or serpentine-group mineral; exact identification requires testing

AI-generated identification · may be incorrect

Small rounded, polished dark green-gray specimen with pale reflective speckles and a subdued vitreous-to-waxy luster. Aventurine is Mohs 6.5–7 with no obvious cleavage; serpentine is softer, Mohs 2.5–5.5, and commonly waxy.

Identified August 27, 2026More mineral →

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At a glance

Common name: Likely polished green aventurine or serpentine pebble
Scientific name: Quartz-rich aventurine (SiO₂) or serpentine-group mineral; exact identification requires testing
Category: mineral
Identified: August 27, 2026
Method: Standard

AI Estimated Value

About $1–$10 as a small tumbled stone; $10–$30 if unusually attractive or confirmed as a quality gemstone material.

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 mica or other inclusions, commonly in metamorphic veins; serpentine forms by hydration of ultramafic rocks. Precise age and origin cannot be determined visually.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and lapidary tumbling; serpentine is also a decorative building stone.

Geological facts

The glittering effect in aventurine is called aventurescence, caused mainly by included mica or hematite. A strong steel-scratch resistance favors aventurine over serpentine.

Field identification & locations

Common sources include India, Brazil, Russia, and Zimbabwe for green aventurine; serpentine occurs worldwide. Test inconspicuously with a steel blade, inspect streak/powder, and use a refractometer or Raman/XRF for confirmation.