mineral

Tumbled green aventurine

Quartz aggregate, chiefly SiO₂, colored by fuchsite mica or other chromium-bearing inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, green, translucent to opaque, with a vitreous luster and faint aventurescence; massive, granular quartz rather than distinct crystals, with no obvious cleavage. The rounded, polished form indicates tumbling.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich material crystallizes with disseminated green mica or other mineral inclusions, commonly in metamorphic or hydrothermal settings; individual pieces may be Precambrian to younger, depending on source.

Uses & applications

Used for inexpensive cabochons, beads, carvings, worry stones, and decorative objects; it has minor ornamental value rather than high gemstone value.

Geological facts

Aventurine’s glittering effect, called aventurescence, comes from reflective plate-like inclusions. Strong green color can also indicate chromium-bearing fuchsite, while some commercial material is dyed quartzite or glass.

Field identification & locations

Identify by its hardness, quartz-like polish, granular texture, and possible sparkles; common sources include India, Brazil, Russia, and Tanzania. The image is consistent with green aventurine but cannot exclude dyed quartzite or serpentine without testing.