mineral

Tumbled green aventurine (probable)

Quartz variety; SiO₂ with disseminated fuchsite or other mica inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, translucent green to brown-green, with a vitreous to subtly sparkly aventurescent luster; massive, cryptocrystalline quartz with no obvious cleavage and conchoidal fracture. The pieces shown are rounded and polished, so natural textures are partly obscured.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz containing reflective mica inclusions, commonly in metamorphic or hydrothermal settings; specimens may range from Precambrian to younger geological ages. Identification is provisional because the image could also represent serpentine, nephrite, or green jasper.

Uses & applications

Used for inexpensive cabochons, beads, carvings, tumbled stones, and ornamental objects; less commonly used as decorative aggregate.

Geological facts

Aventurescence is caused by light reflecting from tiny plate-like inclusions, especially fuchsite mica. Green aventurine is often confused with jade and is generally much less valuable.

Field identification & locations

Look for translucent quartz-like edges, moderate hardness, and glittering mica reflections; it should scratch glass but not quartz. Common sources include India, Brazil, Russia, and Tanzania.