mineral
Tumbled green aventurine (probable)
Quartzite composed mainly of quartz (SiO₂), colored by fuchsite or other mica inclusions
AI-generated identification · may be incorrectTypically 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.
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Physical properties
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.
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.
