mineral

Tumbled green aventurine

Quartz (SiO₂), typically containing fuchsite mica inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; green, translucent to opaque, with a glassy to slightly sparkly appearance. It has a trigonal crystal structure, indistinct cleavage, conchoidal fracture, and specific gravity around 2.6–2.7.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids or melts crystallize quartz with dispersed chromium-bearing fuchsite or other green inclusions; commonly Precambrian metamorphic material later shaped by tumbling. Geological age varies by deposit.

Uses & applications

Used for beads, carvings, cabochons, decorative stone, and inexpensive collectible tumbled specimens; occasionally used as an ornamental aggregate.

Geological facts

The characteristic green color usually comes from fuchsite mica, chromium-bearing mica, or less commonly chlorite. Aventurine’s glitter, called aventurescence, is caused by reflective mineral inclusions.

Field identification & locations

Identify it by its even green color, quartz-like hardness, rounded polish, and possible subtle glitter; it should scratch glass but not quartz. Common sources include India, Brazil, Russia, and Tanzania.