mineral

Tumbled green aventurine (probable)

Quartz aggregate, SiO₂, commonly containing fuchsite mica inclusions

AI-generated identification · may be incorrect

Smooth tumbled stone with dark green color, waxy-to-glassy luster, and faint translucency at the edges; quartz hardness is about 7 Mohs, with no obvious cleavage and specific gravity near 2.6. The uniformly opaque appearance makes green aventurine more likely than jade, though the image alone is not diagnostic.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich fluids or rocks recrystallize with green fuchsite or other mineral inclusions, typically in metamorphic environments; specimens may range from ancient Precambrian rocks to younger deposits. Common sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive metaphysical or collector stones; rarely used industrially beyond decorative aggregate.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mica flakes, but this piece shows little visible sparkle. Similar-looking materials include serpentine, chrysoprase, nephrite, dyed quartz, and glass.

Field identification & locations

Check for natural granular texture, quartz-like hardness, and mica sparkle under strong light; it should scratch glass but not be scratched by a steel knife. Reliable identification requires microscopy, refractive index, or spectroscopy.