mineral

Tumbled green aventurine (probable)

Quartz (SiO₂), typically with fuchsite mica inclusions

AI-generated identification · may be incorrect

Smoothly polished, pale to medium green, translucent to opaque, with a vitreous-to-waxy luster; quartz hardness is about 7 Mohs, with no obvious cleavage and conchoidal fracture. The subdued color and lack of visible sparkle make green serpentine or jade alternatives possible.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when quartz crystallizes with dispersed chromium-bearing fuchsite or other green inclusions, commonly in metamorphic or hydrothermal settings. The pictured piece is tumbled and polished, so its natural texture and structure are obscured.

Uses & applications

Used for carvings, beads, cabochons, ornamental objects, and inexpensive lapidary specimens; it is not generally used as a major construction stone. High-quality vividly green material is marketed as a decorative gemstone.

Geological facts

Green aventurine commonly shows aventurescence—tiny glittering reflections from mica—but this specimen appears relatively low-glitter. Similar-looking green stones include serpentine, prehnite, jadeite, nephrite, and dyed quartz.

Field identification & locations

Common sources include India, Brazil, Russia, and Tanzania. Identification requires testing: quartz-like hardness, quartz density near 2.65, and lack of fibrous texture; reliable jade identification requires laboratory testing.