mineral

Tumbled green aventurine (probable)

Quartzite composed chiefly of quartz (SiO₂), with green fuchsite or other mica inclusions

AI-generated identification · may be incorrect

Smooth, rounded, polished pebble with pale green color and cloudy mottling; likely vitreous to waxy luster. Quartz hardness is about 7 Mohs, no obvious cleavage, and specific gravity about 2.6–2.7. The image alone cannot distinguish aventurine from dyed quartz, serpentine, or pale jade.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when quartz-rich rock recrystallizes and acquires chromium-bearing fuchsite or similar inclusions; the source rock is metamorphic. Quartzites commonly formed during Precambrian to younger metamorphic events, depending on locality.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and tumbled-stone collections; occasionally architectural facing stone.

Geological facts

The green shimmer called aventurescence is caused by reflective mica flakes, though this specimen appears too cloudy and weakly shimmering for confident confirmation.

Field identification & locations

Commonly found as rounded pebbles in tumbled-stone lots. Check with a loupe for sparkly mica, test hardness against glass, and inspect for dye concentration in cracks. The reported Sabah-area location is compatible with transported metamorphic/alluvial material, but provenance cannot be established visually.