mineral

Tumbled green aventurine

Quartz (SiO₂), typically containing fuchsite mica or other chromium-bearing inclusions

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent to opaque green, vitreous to slightly greasy luster, granular quartz structure, and no prominent cleavage. The diffuse green color and subtle glitter are characteristic of aventurine quartz.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz crystallizes in silica-rich veins or metamorphic rocks with disseminated green mica inclusions, commonly during Precambrian to younger hydrothermal processes. This specimen has been cut and polished into a tumbled form.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive decorative stone; it is also marketed as a traditional “luck” stone.

Geological facts

Aventurine’s sparkle, called aventurescence, comes from light reflecting off aligned inclusions; fuchsite commonly produces the green variety. It is often confused with green jade, serpentine, or dyed quartz.

Field identification & locations

Identify by its quartz-like hardness, translucent green body, and mica glitter; it should scratch glass but not be scratched by a steel knife. Common sources include India, Brazil, Russia, and Tanzania.