mineral

Tumbled green aventurine quartz

Aventurine quartz (mostly SiO₂ with green fuchsite mica inclusions)

AI-generated identification · may be incorrect

Typically translucent green with a vitreous luster and subtle glitter; quartz is Mohs 7, has a trigonal crystal structure and no cleavage, with conchoidal fracture. The rounded shape indicates mechanical tumbling and polishing.

Identified September 3, 2026More mineral →

Explore Tumbled green aventurine quartz 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 quartz-rich silica crystallizes with disseminated green fuchsite mica, producing aventurescence; deposits commonly occur in metamorphic and hydrothermal environments. The specimen’s precise age cannot be determined visually.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornamental stone, and decorative objects; generally a common collector material rather than a high-value gemstone.

Geological facts

Aventurine’s shimmering effect, called aventurescence, comes from reflective mineral platelets; green varieties are commonly colored by fuchsite, while some commercial material is dyed quartz or glass.

Field identification & locations

Identify it by its uniform green color, rounded polish, quartz-like hardness, and possible sparkles under directional light; major sources include India, Brazil, Russia, and Tanzania. A scratch test should be avoided on finished pieces.