mineral

Tumbled green aventurine

Quartzite dominated by quartz (SiO₂), commonly colored by fuchsite mica or chlorite

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque blue-green to emerald-green color, waxy to vitreous luster, granular quartz crystal structure, and no obvious cleavage. The rounded shape and smooth surface indicate tumbling and polishing.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when quartz-rich rock recrystallizes during metamorphism and incorporates green chromium-bearing fuchsite or chlorite; ages vary with the source terrane. It commonly occurs in metamorphic belts and hydrothermal quartz veins.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornamental objects, and decorative stone; it is also marketed as a “luck” or prosperity stone.

Geological facts

The green color and subtle mottling are typical of fuchsite-bearing aventurine, though this specimen’s exact mineral content requires testing. It is often confused with jade, but aventurine is generally lighter, more granular, and less tough.

Field identification & locations

Identify by its quartz-like hardness, granular texture, green color, and occasional glitter from mica; it should scratch glass but not quartz. Common sources include India, Brazil, Russia, Tanzania, and China.