mineral

Tumbled green aventurine

Quartz (SiO₂), commonly containing fuchsite mica inclusions

AI-generated identification · may be incorrect

Hardness about 7 Mohs; opaque to translucent green, with a smooth rounded polish and typically vitreous-to-waxy luster. Quartz has a trigonal crystal structure and no cleavage; the pictured piece shows little or no aventurescence.

Identified August 9, 2026More mineral →

Explore Tumbled green aventurine in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz in metamorphic or hydrothermal environments, with chromium-bearing fuchsite producing the green color. Deposits commonly occur in Proterozoic metamorphic rocks, though the specimen’s age cannot be determined visually.

Uses & applications

Used as inexpensive cabochons, beads, carvings, tumbled stones, and ornamental material; rarely used as a minor aggregate or decorative stone.

Geological facts

Aventurine is named for aventurescence, a glittering reflection caused by inclusions; green material is often confused with jade, serpentine, or dyed quartzite.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Identify by its quartz-like hardness, cool green color, rounded polish, and possible glitter; glass imitations are softer and may show bubbles.