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; pale to medium green, opaque, with a waxy to vitreous luster and granular quartz texture. The rounded, polished surface indicates a tumbled specimen; no cleavage, irregular fracture, specific gravity about 2.6–2.7.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich rock recrystallizes and incorporates green chromium-bearing mica or chlorite, usually in metamorphic settings. Its exact geological age cannot be determined from the photograph; common commercial material comes from India, Brazil, Russia, and Tanzania.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive decorative stone; occasionally used as aggregate or facing material.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica inclusions, though this piece appears only subtly sparkly. Green aventurine is often marketed as a “stone of opportunity,” but that is a cultural belief rather than a geological property.

Field identification & locations

Identify it by its green quartz-rich body, granular texture, rounded polish, and possible tiny mica flashes; distinguish it from softer dyed jade or glass by its hardness and natural texture. Common sources include India and Brazil.