mineral

Tumbled green aventurine (probable)

Quartzite rich in quartz, with fuchsite mica inclusions; SiO₂

AI-generated identification · may be incorrect

Pale green, opaque to translucent, with a subtle mottled or sparkly appearance and vitreous-to-waxy luster; quartz has Mohs hardness 7, no cleavage, and a granular crystalline structure. The rounded shape indicates tumbling and polishing.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich sandstone recrystallizes into quartzite, with green fuchsite or other mica producing the color; typically associated with metamorphic environments, commonly Precambrian to Paleozoic in age. Major sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for beads, cabochons, carvings, meditation stones, and inexpensive ornamental objects; also used decoratively as polished aggregate. It is generally a low-value gemstone material.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mineral inclusions, though this specimen appears only weakly glittery. Similar-looking green stones include serpentine, jade, green jasper, and amazonite.

Field identification & locations

Look for green quartzite-like material, granular texture, moderate-to-strong translucency at thin edges, and occasional mica flashes; a glass scratch test can help confirm hardness but may damage the specimen. Exact identification requires microscopy or compositional testing.