mineral
Tumbled green aventurine or quartzite pebble
Quartz (SiO₂), likely aventurine-bearing quartzite
AI-generated identification · may be incorrectPale 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.
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Physical properties
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.
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.
