mineral

Tumbled green aventurine (likely)

Quartzite dominated by quartz (SiO₂), with green fuchsite mica or chlorite inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, green to blue-green, translucent to opaque, with a vitreous luster and subtle glitter. The rounded, polished form obscures original texture; no obvious cleavage is visible.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich rock recrystallizes and incorporates green mica or chlorite during metamorphism, commonly in Precambrian terrains. The pictured piece is tumbled and polished rather than naturally rounded.

Uses & applications

Used for beads, cabochons, ornaments, carvings, and inexpensive decorative stone; occasionally used as aggregate or facing stone. Common retail specimens generally have modest value.

Geological facts

Aventurine’s characteristic aventurescence is caused by light reflecting from tiny plate-like mineral inclusions; weak glitter may be difficult to see in photographs.

Field identification & locations

Identify it by its green color, cloudy quartz appearance, hardness, and possible sparkly reflections; distinguish it from jade by its granular quartz texture and lower toughness. Common sources include India, Brazil, Russia, and Tanzania.