mineral

Tumbled green aventurine (probable)

Quartzite rich in quartz and fuchsite mica; SiO₂

AI-generated identification · may be incorrect

Pale green, fine-grained, weakly sparkly or silky luster, rounded by tumbling, with no visible cleavage; quartz hardness is about Mohs 7 and specific gravity about 2.6. The image cannot confirm composition, and it could also be serpentine or green quartzite.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when quartz recrystallizes with green fuchsite mica, commonly during metamorphism; the source rock may be Precambrian to younger depending on locality. This specimen is human-polished rather than naturally weathered.

Uses & applications

Commonly sold as a low-cost lapidary stone for cabochons, beads, carvings, worry stones, and tumbled specimens; it has little construction use in this small form.

Geological facts

The subtle glitter is called aventurescence and results from light reflecting off included mica or other minerals. “Aventurine” describes the optical effect and color variety, not one single mineral species.

Field identification & locations

Look for a green body color, quartz-like hardness, and tiny reflective flashes; it should resist scratching by a steel knife. Common sources include India, Brazil, Russia, and Tanzania; acid testing is not diagnostic.