mineral

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite mica inclusions

AI-generated identification · may be incorrect

Typically medium green with a sparkly, micaceous aventurescence; Mohs hardness about 7, vitreous-to-waxy luster, massive granular structure, and no obvious cleavage. The rounded shape indicates tumbling or natural abrasion.

Identified August 11, 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

Forms when quartz-rich veins or metamorphic rocks crystallize with chromium-bearing fuchsite mica, commonly during regional metamorphism. Important deposits occur in India, Brazil, Russia, and Tanzania; the specimen’s exact age cannot be determined visually.

Uses & applications

Used for beads, cabochons, carvings, decorative stone, and inexpensive jewelry; also sold as a lapidary and metaphysical material.

Geological facts

Aventurine’s glitter comes from reflective mineral inclusions rather than quartz itself; fuchsite produces green colors, while mica flakes create the characteristic shimmer.

Field identification & locations

Identify it by green color, visible glitter, glassy hardness, and inability to scratch it with a steel knife; confirm with a streak, hardness, and mineralogical examination. Similar material includes green jasper and serpentine.