mineral

Tumbled green stone, likely serpentine or aventurine

Probable serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or green aventurine quartz (SiO₂)

AI-generated identification · may be incorrect

Rounded, polished, translucent yellow-green body with fine darker inclusions and a waxy to vitreous luster; likely hardness about 2.5–4 for serpentine or 6.5–7 for aventurine. Crystal structure cannot be confirmed from the image.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Serpentine forms when ultramafic rocks undergo hydrothermal alteration; aventurine forms in quartz veins with mica or fuchsite inclusions. Geological ages vary widely by deposit.

Uses & applications

Usually sold as a decorative tumbled stone, worry stone, or lapidary material; higher-quality green aventurine is used in beads and inexpensive jewelry.

Geological facts

The smooth shape is human-tumbled, and lighting can make the color appear more yellow or green. A hardness test and close inspection of inclusions are needed for reliable identification.

Field identification & locations

Common sources include California, Vermont, Italy, China, India, and Brazil, depending on the material. Serpentine is softer and may scratch with a steel blade; aventurine should resist scratching and show glittery mica inclusions.