mineral

Tumbled green aventurine (probable)

Quartz (SiO₂) with fuchsite mica inclusions

AI-generated identification · may be incorrect

Pale green, smoothly tumbled, translucent to opaque, with a soft waxy-to-vitreous luster and faint granular texture. Quartz hardness is Mohs 7; no obvious cleavage, conchoidal fracture, and specific gravity about 2.65. The image alone cannot distinguish it confidently from green chalcedony or pale nephrite.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms in silica-rich metamorphic or hydrothermal environments, where chromium-bearing fuchsite produces the green color; quartz is geologically common from Precambrian to recent ages. Common sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for inexpensive cabochons, beads, carvings, polished stones, and decorative objects; it has limited industrial value compared with ordinary quartz.

Geological facts

Aventurine’s characteristic aventurescence is caused by reflective mica platelets, though this specimen appears only weakly sparkly. The rounded shape indicates human tumbling rather than natural crystal growth.

Field identification & locations

Identify by green color, quartz-like hardness, lack of cleavage, and occasional glitter under direct light; a steel file should not scratch it, while quartz should scratch glass. Common tumbled pieces typically sell for $2–$10; larger attractive specimens or jewelry may range from $15–$50.