gemstone

Green aventurine cabochon (likely)

Quartzite/aventurine quartz, predominantly SiO₂ with possible fuchsite mica

AI-generated identification · may be incorrect

Green, opaque-to-translucent, polished oval cabochon with a vitreous-to-waxy luster; quartz hardness is about Mohs 7, with no obvious cleavage and granular crystal structure. The surface markings appear painted or engraved, so identification is provisional.

Identified August 8, 2026More gemstone →

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Physical properties

Formation & geological history

Green aventurine forms when quartz-rich material recrystallizes with dispersed green fuchsite mica or other inclusions, commonly in metamorphic settings. Geological ages vary by deposit, and the pictured piece is shaped and polished rather than natural.

Uses & applications

Used for inexpensive cabochons, beads, carvings, ornaments, and decorative objects; it is generally not a high-value gemstone.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica or hematite inclusions; strong uniform green color can also indicate dyed quartzite or glass imitation.

Field identification & locations

Look for subtle glitter under angled light, granular texture, quartz-like hardness, and absence of bubbles; glass imitations may show conchoidal fracture and bubbles. Common sources include India, Brazil, Russia, and Tanzania.