mineral

Tumbled green aventurine quartz

Quartz, SiO₂, with fuchsite or other green mica inclusions

AI-generated identification · may be incorrect

Typically green, translucent to opaque, with a vitreous luster and weak glittery aventurescence; hardness about 6.5–7 Mohs, trigonal crystal structure, no cleavage, and specific gravity near 2.65. The smooth rounded shape indicates tumbling and polishing.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz in metamorphic or hydrothermal environments, incorporating chromium-bearing fuchsite mica or other inclusions; most commercial material comes from India, Brazil, Russia, and Tanzania. The specimen’s precise geological age cannot be determined visually.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive decorative stone; it is also sold as a lapidary and metaphysical material.

Geological facts

Aventurine’s characteristic sparkle results from light reflecting from aligned mineral inclusions, not from the quartz itself. Green aventurine is often confused with jade, but it is generally less tough and more visibly sparkly.

Field identification & locations

Identify it by its green quartz body, scattered reflective flecks, glassy luster, and hardness sufficient to scratch ordinary glass; jade is tougher and usually lacks aventurescence. Confirm with magnification, hardness, and specific-gravity testing.