mineral

Tumbled green stone, likely serpentine or aventurine

Indeterminate; possible serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or green quartzite/aventurine (SiO₂)

AI-generated identification · may be incorrect

Smooth, rounded, opaque to slightly translucent green pebble with a dull-to-waxy luster; apparent hardness is roughly 3–7 Mohs depending on identification, and no cleavage is visible.

Identified August 22, 2026More mineral →

Explore Tumbled green stone, likely serpentine or aventurine in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Tumbled green stone, likely serpentine or aventurine
Scientific name: Indeterminate; possible serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or green quartzite/aventurine (SiO₂)
Category: mineral
Identified: August 22, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as a common tumbled stone; higher only if verified as fine jade, chrysoprase, or another rare 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

Smooth, rounded, opaque to slightly translucent green pebble with a dull-to-waxy luster; apparent hardness is roughly 3–7 Mohs depending on identification, and no cleavage is visible.

Formation & geological history

Serpentine forms when ultramafic rocks are hydrothermally altered; aventurine forms from quartz-rich rocks containing green mica or fuchsite. Geological age and origin cannot be determined from the photograph.

Uses & applications

Commonly sold as a tumbled decorative stone, worry stone, or cabochon; serpentine is also used for carving and ornamental stone, while aventurine is used in jewelry and lapidary work.

Geological facts

The uniform shape and smooth surface indicate human tumbling or polishing. Color alone is insufficient for reliable identification among serpentine, aventurine, jade substitutes, and dyed stones.

Field identification & locations

Test hardness against glass (about 5.5 Mohs): scratching glass suggests quartzite/aventurine, while failure suggests serpentine; a gemological test for density, refractive index, and composition is needed for confirmation.