mineral

Tumbled green aventurine

Quartz (SiO₂) with fuchsite mica inclusions

AI-generated identification · may be incorrect

Typically pale to medium green, vitreous-to-waxy luster, cryptocrystalline quartz; Mohs hardness 6.5–7, no obvious cleavage, specific gravity about 2.6. The smooth rounded shape indicates tumbling and polishing.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize as quartzite or massive quartz containing chromium-bearing fuchsite mica; most material is Proterozoic to younger metamorphic rock. Common sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for inexpensive cabochons, beads, carvings, polished stones, and decorative objects; also sold as a common collector and metaphysical stone.

Geological facts

The green color is commonly caused by fuchsite, though chromium-bearing chlorite can contribute. Aventurine may show subtle sparkly aventurescence from reflective mica flakes, which is not clearly visible here.

Field identification & locations

Identify it by its fairly uniform mint-green color, quartz-like hardness, and occasional mica sparkle; it should scratch glass but not quartz. Jade, often imitated by green aventurine, is tougher and generally denser.