mineral

Tumbled green aventurine (probable)

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

AI-generated identification · may be incorrect

Green, opaque to slightly translucent, glassy-to-waxy luster and smoothly polished surface; quartz hardness is about 7 Mohs, with no obvious cleavage and granular quartz texture. The blurred image prevents confident distinction from serpentine, jade, or dyed chalcedony.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Usually forms when quartz-rich sediment or rock is metamorphosed and enriched with chromium-bearing fuchsite; most commercial material comes from India, Brazil, and Russia. Geological ages vary by deposit, commonly Precambrian to Paleozoic.

Uses & applications

Popular as inexpensive cabochons, beads, tumbled stones, carvings, and decorative objects; occasionally used as a minor ornamental stone.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica or hematite inclusions, though this specimen appears relatively non-sparkly.

Field identification & locations

Identify by green color, quartz-like hardness, and possible glitter under strong light; it should scratch glass but not be scratched by a steel blade. A refractive-index or microscope test separates it from jade and serpentine.