mineral

Tumbled green aventurine (probable)

Quartzite composed mainly of quartz (SiO₂), colored by fuchsite or other mica inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, green color, translucent to opaque, and a smooth polished surface with vitreous-to-waxy luster; quartz grains have no prominent cleavage. The image is out of focus, so identification is provisional; it could also be green glass or another green stone.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone is metamorphosed and recrystallized, commonly with chromium-bearing mica producing green color. Most commercial material comes from India, Brazil, Russia, and Tanzania; age varies by deposit.

Uses & applications

Used as inexpensive tumbled stone, beads, carvings, and ornamental objects; occasionally used for countertops and decorative stone. Common tumbled pieces generally have modest collector value.

Geological facts

Aventurine may show aventurescence—sparkling reflections from mica inclusions—but this specimen appears relatively uniform and non-sparkly.

Field identification & locations

Check for tiny mica sparkles, quartz-like hardness, and a specific gravity near 2.6–2.7; it should scratch ordinary glass but not quartz. Common tumbled specimens are sold worldwide.