mineral

Tumbled green aventurine

Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions

AI-generated identification · may be incorrect

Typically green, opaque to translucent, with a vitreous-to-waxy luster and subtle glitter from mica; Mohs hardness 6.5–7, no prominent cleavage, and granular quartz crystal structure. The pictured rounded, polished pebble is consistent with aventurine, though exact identification requires testing.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich rock recrystallizes and incorporates chromium-bearing fuchsite or other green inclusions, commonly during metamorphism. Deposits occur in Precambrian metamorphic terrains, especially in India, Brazil, Russia, and Tanzania.

Uses & applications

Used for beads, cabochons, carvings, countertops, and ornamental stone; common tumbled pieces have modest decorative value.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mica or hematite platelets, although some pieces show little visible sparkle. It is a quartzite variety rather than a distinct mineral species.

Field identification & locations

Field clues include green color, granular texture, glassy translucence at thin edges, and resistance to scratching by steel; it should scratch glass but not be scratched by a steel knife. Green stones without sparkle may instead be serpentine, jade, or jasper.