mineral

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica

AI-generated identification · may be incorrect

Pale green, translucent to opaque, with a vitreous-to-waxy luster and granular texture; hardness about 6.5–7 Mohs, no obvious cleavage, and quartz’s trigonal crystal structure. The rounded shape indicates human tumbling and polishing.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich rock recrystallizes during metamorphism, with chromium-bearing fuchsite producing the green color; most specimens are Precambrian to Paleozoic in source rocks. Common commercial material comes from India, Brazil, Russia, and Tanzania.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, countertops, and ornamental objects; inexpensive in jewelry and metaphysical markets.

Geological facts

Aventurine’s characteristic shimmer, called aventurescence, comes from reflective mica or hematite inclusions, though this specimen appears relatively low in visible sparkle.

Field identification & locations

Identify by its green quartz-like body, granular fracture, high hardness, and lack of bubbles; glass imitations are softer and may show rounded bubbles. Exact identification would benefit from a close-up under magnification and a hardness test.