mineral

Tumbled greenish stone, possibly serpentine or aventurine

Uncertain; likely serpentine-group mineral or quartz-rich green aventurine

AI-generated identification · may be incorrect

Small rounded, polished/tumbled specimen with olive-green and pale gray-green coloration, subdued waxy to vitreous luster, and no visible cleavage. Estimated hardness is about 2.5–4 for serpentine or 6.5–7 for aventurine; the blurred image prevents reliable distinction.

Identified September 4, 2026More mineral →

Explore Tumbled greenish stone, possibly serpentine or aventurine in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Serpentine forms when ultramafic rocks undergo hydrothermal alteration; aventurine forms when quartz crystallizes with green mica or fuchsite. Both are common in metamorphic or hydrothermal settings, generally formed from Precambrian to younger rocks.

Uses & applications

Used as a decorative, carving, and jewelry stone; serpentine is also an ornamental architectural material. Common tumbled pieces usually have modest value.

Geological facts

The specimen appears human-tumbled, so natural crystal faces and diagnostic texture are absent. A hardness test and examination of streak or internal sparkly inclusions would improve identification.

Field identification & locations

Commonly found as rounded green pebbles or lapidary pieces from serpentinite belts, India, Brazil, Russia, China, and the United States. Aventurine may show glittering mica; serpentine is typically waxier and softer.