mineral

Tumbled green aventurine (probable)

Quartz, SiO₂, with green fuchsite mica inclusions

AI-generated identification · may be incorrect

Usually Mohs hardness 6.5–7, translucent to opaque, pale green, with vitreous-to-waxy luster and no visible cleavage; quartz is trigonal, though the rounded shape is human-tumbled. The smooth, uniform appearance could also represent dyed or polished green quartz/chalcedony.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz containing chromium-bearing fuchsite or other green inclusions, commonly in metamorphic rocks. Deposits are especially known from India, Brazil, Russia, and Tanzania; exact geological age depends on locality.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive jewelry; occasionally used as decorative stone. It has limited industrial value compared with ordinary quartz.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mineral inclusions, but this specimen appears too small and smooth to show it clearly.

Field identification & locations

Identify it by testing hardness against glass, looking for fine mica glitter, and checking that the color is not concentrated in cracks; glass or plastic imitations are softer. Common tumbled pieces sell for about $1–$10; unusually vivid, strongly aventurescent specimens may reach $20–$50.