mineral

Tumbled green aventurine (probable)

Quartz, SiO₂, with green fuchsite mica inclusions

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale mint-green, opaque to translucent, with a smooth tumbled surface and subtle pearly or glassy luster. Quartz is trigonal and has no cleavage, though the specimen’s exact identity cannot be confirmed from an image alone.

Identified August 19, 2026More mineral →

Explore Tumbled green aventurine (probable) 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

Typically forms in silica-rich metamorphic or hydrothermal settings when quartz crystallizes around chromium-bearing fuchsite mica; deposits are commonly Precambrian to younger. The rounded shape is human-produced by tumbling.

Uses & applications

Used for inexpensive cabochons, beads, carvings, polished stones, and decorative objects; occasionally used as a low-cost gemstone. Common tumbled pieces have modest collector value.

Geological facts

Green aventurine is often confused with jade, amazonite, chrysoprase, and dyed quartzite. Its fine sparkle, if visible under strong light, comes from reflective mica inclusions.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. A glassy feel, hardness sufficient to scratch glass, and microscopic glitter favor aventurine; laboratory testing is needed to distinguish it from similarly colored materials.