mineral

Tumbled green aventurine (probable)

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

AI-generated identification · may be incorrect

Pale green, opaque-to-translucent, waxy/glassy luster, and rounded from tumbling; quartz hardness is about 7 Mohs, with no obvious cleavage and specific gravity near 2.6. The image cannot confirm composition, and it may instead be serpentine or another green stone.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when quartz-rich rock recrystallizes and incorporates chromium-bearing fuchsite; deposits are commonly Precambrian to Paleozoic, depending on locality. It occurs in metamorphic terrains and quartz veins.

Uses & applications

Used for inexpensive cabochons, beads, carvings, tumbled stones, ornamental objects, and lapidary work; rarely used as a dimension stone.

Geological facts

The characteristic aventurescence—sparkling reflections from mica—is subtle or absent in this specimen. A glassy surface, quartz hardness, and mica glitter help distinguish aventurine from softer green minerals.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Test inconspicuously: it should scratch ordinary glass, while a steel knife should not scratch it; acid has little effect.