mineral

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), colored by fuchsite or other green mica inclusions

AI-generated identification · may be incorrect

Polished, translucent to opaque green pebble with a vitreous-to-waxy luster and faint internal fibrous/cloudy texture. Quartz hardness is about 7 Mohs; cleavage is absent, fracture is conchoidal, and specific gravity is approximately 2.6–2.7.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Usually formed when quartz-rich sediments or veins recrystallize into quartzite, with chromium-bearing mica producing the green color; such rocks range from Precambrian to younger geological ages. The specimen has been cut or tumbled and polished.

Uses & applications

Used for beads, cabochons, carvings, decorative stones, and inexpensive collector specimens; occasionally used as ornamental aggregate.

Geological facts

Aventurine’s characteristic glitter, called aventurescence, comes from reflective mica inclusions, though this piece appears only subtly glittery. Similar green stones may be jade, serpentine, fluorite, or dyed quartzite.

Field identification & locations

Common sources include India, Brazil, Russia, Tanzania, and China. Look for green color, quartz-like hardness, absence of cleavage, and mica sparkle; a definitive identification requires testing or microscopy.