mineral

Tumbled green aventurine

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

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; opaque blue-green to forest-green, vitreous to waxy luster, massive granular texture, and no visible cleavage. The mottled patches and occasional subtle sparkle are typical of fuchsite-bearing aventurine.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich sediments or veins recrystallize into quartzite, with chromium-bearing mica producing the green color; deposits are commonly Precambrian to younger metamorphic rocks. This specimen has been cut and polished into a tumbled stone.

Uses & applications

Used for decorative objects, cabochons, beads, carvings, and inexpensive jewelry; it is also collected as a lapidary material.

Geological facts

Aventurine’s characteristic aventurescence comes from reflective mineral inclusions, though green material may show little visible sparkle. It is often confused with dyed quartzite, serpentine, or green glass.

Field identification & locations

Common sources include India, Brazil, Russia, Tanzania, and China. Identify it by its quartz hardness, granular appearance, natural mottling, and lack of bubbles or uniform glassy color; a glass scratch test should be avoided on polished pieces.