mineral

Tumbled pale green stone, possibly serpentine or green aventurine

Uncertain from photograph; likely serpentine-group mineral, chiefly antigorite/lizardite, or quartz-bearing aventurine

AI-generated identification · may be incorrect

Rounded and polished, pale yellow-green with cloudy gray-green patches and low vitreous to waxy luster. Serpentine has Mohs hardness 2.5–4 and specific gravity about 2.5–2.6; aventurine quartz is harder, about 7, so a scratch test is diagnostic.

Identified September 14, 2026More mineral →

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At a glance

Common name: Tumbled pale green stone, possibly serpentine or green aventurine
Scientific name: Uncertain from photograph; likely serpentine-group mineral, chiefly antigorite/lizardite, or quartz-bearing aventurine
Category: mineral
Identified: September 14, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for a common tumbled stone; roughly $20–$100 for an unusually attractive, large, or well-identified specimen.

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

Serpentine forms when ultramafic rocks undergo hydration during metamorphism; green aventurine forms when quartz-rich fluids crystallize with mica inclusions. Ages vary widely by deposit, commonly Paleozoic or younger.

Uses & applications

Used as a decorative tumbled stone, carving material, and ornamental aggregate; higher-quality green aventurine is used in inexpensive jewelry. Serpentine is also used decoratively but should not be cut or powdered without checking for asbestos-forming fibers.

Geological facts

The image does not show diagnostic crystals, veining, or cleavage, so exact identification is uncertain. The smooth shape indicates human tumbling rather than a natural outcrop surface.

Field identification & locations

Common sources include California, Vermont, Italy, New Zealand, China, India, and Brazil. Check hardness, streak, translucency, and specific gravity; avoid inhaling dust because some serpentine can contain fibrous chrysotile.