mineral

Tumbled green aventurine or quartzite pebble

Quartz (SiO₂), likely aventurine-bearing quartzite

AI-generated identification · may be incorrect

Pale green-gray, smoothly tumbled, with a matte-to-waxy surface and fine granular texture; quartz hardness is about 7 Mohs, with no visible cleavage and a compact crystalline structure. The subdued color and lack of obvious sparkle make identification from the photo uncertain.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartzite forms when quartz-rich sandstone is metamorphosed; green aventurine gains color from fuchsite or other inclusions. Such material commonly derives from Precambrian metamorphic rocks, though the specimen has been shaped and polished by tumbling.

Uses & applications

Used for decorative stones, carvings, beads, countertops, and inexpensive cabochons; this small tumbled piece is primarily a collector or ornamental item.

Geological facts

Aventurine may show aventurescence—tiny glittering reflections from mica—but this specimen appears weakly or non- aventurescent. Similar green pebbles can also be serpentine, nephrite, or glass, so testing is useful.

Field identification & locations

Common sources include India, Brazil, Russia, and parts of Africa. Check for quartz hardness by seeing whether it scratches ordinary glass; a specific-gravity or streak test can help distinguish it from softer green minerals.