mineral

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent green with blue-gray and dark speckling, and a vitreous to waxy polished luster. Quartz has a trigonal crystal structure and no cleavage; the rounded shape is human-tumbled.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone recrystallized during metamorphism, with chromium-bearing fuchsite producing the green color. Precise age is locality-dependent; common material comes from India, Brazil, and Russia.

Uses & applications

Used for beads, cabochons, carvings, décor, and inexpensive jewelry; not generally used as a structural stone. Typical value is about $2–$15 for a small tumbled piece, or $10–$40 for a larger/high-quality specimen.

Geological facts

The blue-gray areas may indicate sodalite, dumortierite, or other inclusions, so the exact variety cannot be confirmed visually. It may alternatively be green jasper or serpentine.

Field identification & locations

Identify by its quartz-like hardness, fine granular texture, green body, and reflective mica flecks; it should scratch glass but not be scratched by a steel knife. Common sources include India, Brazil, Russia, and Zimbabwe.