mineral

Likely tumbled green aventurine or serpentine

Aventurine quartz (SiO₂ with fuchsite mica) or serpentine-group mineral

AI-generated identification · may be incorrect

Small polished/tumbled green stone with mottled dark-green color and low-to-waxy luster; aventurine is Mohs 7 with quartz’s hexagonal structure, while serpentine is Mohs 2.5–5 and commonly massive. The image is too low-resolution for confident separation.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Green aventurine forms when quartz crystallizes with chromium-bearing fuchsite mica, typically in metamorphic veins; serpentine forms by hydration of ultramafic rocks. These materials are generally geologically ancient, commonly Paleozoic or older depending on locality.

Uses & applications

Used as inexpensive beads, cabochons, carving stone, décor, and lapidary material; serpentine is also used ornamentally and sometimes as a marble substitute.

Geological facts

Aventurine’s characteristic glitter ( aventurescence) comes from reflective mica inclusions, while serpentine commonly has a smooth, greasy feel and fibrous varieties may resemble jade.

Field identification & locations

Common sources include India, Brazil, Russia, and China. Check hardness, streak, and sparkle: quartz scratches glass and may glitter; serpentine is softer and usually non-sparkly.