mineral

Tumbled green aventurine and/or serpentine

Quartz variety aventurine (SiO₂) and possibly serpentine-group minerals

AI-generated identification · may be incorrect

Polished translucent to opaque green pebbles with vitreous-to-waxy luster; aventurine is Mohs 6.5–7, while serpentine is softer at about 2.5–5.5. Rounded shapes are human-tumbled, and the visible glitter or fibrous mottling would help distinguish them.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Green aventurine forms when quartz crystallizes with fuchsite mica or other inclusions, commonly in hydrothermal veins and metamorphic rocks; serpentine forms by hydration of ultramafic rocks. Geological ages vary by deposit.

Uses & applications

Used for inexpensive beads, carvings, cabochons, décor, and lapidary practice; not generally used as structural stone in this tumbled form.

Geological facts

Aventurine’s green color commonly comes from chromium-rich fuchsite, producing aventurescence—tiny reflective flashes. Some commercial “green aventurine” batches are actually dyed quartz or serpentine.

Field identification & locations

Common sources include India, Brazil, Russia, and China. Test cautiously: aventurine scratches glass, whereas serpentine usually does not; a loupe may reveal mica sparkle or serpentine’s cloudy, fibrous texture.