mineral

Tumbled green aventurine

Quartz (SiO₂), typically colored by fuchsite or other chromium-bearing inclusions

AI-generated identification · may be incorrect

Green, opaque to translucent, with a smooth polished surface and vitreous luster; hardness 6.5–7 Mohs, trigonal crystal structure, no prominent cleavage. The image is consistent with aventurine, though a photograph cannot confirm the exact material.

Identified October 5, 2026More mineral →

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Physical properties

Formation & geological history

A quartz variety formed as silica-rich fluids crystallize in metamorphic or hydrothermal settings; its geological age depends on the deposit. Green color commonly comes from fine mica inclusions.

Uses & applications

Commonly tumbled for jewelry, beads, and decorative objects; also collected as an inexpensive ornamental stone.

Geological facts

Aventurine’s subtle sparkle, called aventurescence, results from reflective mineral inclusions; not all green tumbled stones sold as aventurine are natural quartz.

Field identification & locations

Look for a glassy luster, hardness sufficient to scratch glass, and possible fine shimmer; common sources include India, Brazil, and Russia. A small tumbled piece like this is typically worth about $1–$10 USD.