metamorphic

Green aventurine quartzite (likely)

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque to slightly translucent green with tan matrix, vitreous to waxy luster, and irregular fracture. The polished-looking green surface may be a cut or weathered face; no obvious cleavage is visible.

Identified September 11, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sandstone recrystallized under heat and pressure, with chromium-bearing mica or chlorite producing the green color. Quartzite commonly formed during Precambrian to Paleozoic mountain-building, though the specimen’s age cannot be determined visually.

Uses & applications

Used as an ornamental stone, carving material, cabochons, beads, countertops, and decorative aggregate. Its toughness and attractive green color make it popular with collectors.

Geological facts

Green aventurine is often marketed as a gemstone, but true aventurine shows mica-related aventurescence—sparkling reflections—which are not obvious here. Similar green material may instead be serpentine or nephrite.

Field identification & locations

Check for hardness: quartzite should scratch glass and resist a steel blade; acid produces no reaction. Common sources include India, Brazil, Russia, and parts of the United States; confirm with a loupe or specific-gravity test.