mineral

Tumbled green aventurine

Quartz (SiO₂) containing green fuchsite mica inclusions; a variety of quartzite

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, green with a vitreous to softly sparkling luster, and massive rather than visibly crystalline; no prominent cleavage. The polished, rounded shape is human-finished.

Identified September 27, 2026More mineral →

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Physical properties

Typically Mohs 6.5–7, green with a vitreous to softly sparkling luster, and massive rather than visibly crystalline; no prominent cleavage. The polished, rounded shape is human-finished.

Formation & geological history

Forms when silica-rich fluids crystallize quartz with chromium-bearing mica inclusions; the rock source is commonly metamorphosed quartz-rich material. Quartz deposits occur in rocks of many geological ages.

Uses & applications

Used for beads, cabochons, carvings, decorative objects, and inexpensive jewelry; also collected as a polished ornamental stone.

Geological facts

Aventurine’s subtle glitter, called aventurescence, comes from reflective mineral inclusions; green color is commonly associated with fuchsite.

Field identification & locations

Identify by its opaque-to-translucent green color, quartz-like hardness, and occasional fine sparkle. Green aventurine is widely sourced from India, Brazil, Russia, and elsewhere; this small tumbled piece cannot be assigned a precise locality from appearance alone.