metamorphic

Tumbled/polished aventurine (likely green quartzite)

Quartzite, predominantly quartz (SiO₂), colored by fuchsite or chlorite inclusions

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale green-gray, opaque to translucent, with a silky/waxy luster and fine granular crystalline texture. The smoothly shaped, polished surface suggests a cut or tumbled specimen rather than a natural crystal.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone recrystallized under metamorphic heat and pressure, with green mica or chlorite producing the color. Quartzite commonly formed during Precambrian to Paleozoic mountain-building events, depending on locality.

Uses & applications

Used for cabochons, carvings, beads, and ornamental stone; quartzite is also used as aggregate, tiles, and building stone. This small polished piece has modest lapidary and educational value.

Geological facts

Aventurine quartz is technically quartz containing reflective inclusions, while green quartzite may look similar but is more granular and generally less sparkly. The image does not show enough detail for a definitive distinction.

Field identification & locations

Look for quartz-like hardness, resistance to scratching by steel, granular texture, and green mica/chlorite flecks; common sources include India, Brazil, Russia, and the United States. Estimated value: $2–$10 for a small common polished piece; higher only with strong color or sparkle.