mineral

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite or other green mica inclusions

AI-generated identification · may be incorrect

Usually Mohs hardness 6.5–7, translucent to opaque green, with a vitreous-to-waxy luster and no visible cleavage; the pictured piece is smoothly tumbled and lacks obvious sparkle, so green chalcedony or serpentine are alternatives.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz-rich material formed in hydrothermal veins or metamorphic rocks, with green mica or chlorite producing the color; specimens commonly derive from Precambrian to younger metamorphic terrains.

Uses & applications

Used for carvings, beads, cabochons, worry stones, and inexpensive ornamental objects; not generally used as a major construction stone.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mineral inclusions, especially fuchsite mica, but not every green tumbled stone displays it strongly.

Field identification & locations

Check for tiny glittering flashes, quartz-like hardness, and resistance to a steel knife; serpentine is softer, while jade is tougher and denser. Common sources include India, Brazil, Russia, and Zimbabwe.