mineral

Green aventurine quartz sphere

Quartz, SiO₂, with fuchsite or other green mica inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, translucent to opaque, green, with a vitreous to subtly aventurescent luster; trigonal quartz structure and indistinct cleavage. The pictured polished sphere shows mottled green mica-rich inclusions.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich hydrothermal fluids crystallize with chromium-bearing fuchsite mica, commonly in metamorphic rocks; deposits are mainly Precambrian to younger, depending on locality.

Uses & applications

Used for beads, cabochons, spheres, carvings, and decorative objects; generally an ornamental material rather than a major industrial stone.

Geological facts

Aventurine’s glitter, called aventurescence, comes from reflective mineral inclusions; strong glitter indicates abundant mica or hematite, while some green material sold as aventurine is dyed quartzite.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Identify it by its green quartz body, mottled texture, hardness near quartz, and occasional mica sparkle; it should not scratch easily with a steel knife.