mineral

Tumbled green aventurine (likely)

Quartz, SiO₂, containing green fuchsite mica or other inclusions

AI-generated identification · may be incorrect

Translucent pale green, vitreous to waxy luster, granular crystalline structure, no obvious cleavage; Mohs hardness about 6.5–7, specific gravity ~2.6. The rounded, polished form is machine-tumbled.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz-rich material crystallizes with chromium-bearing fuchsite or other green inclusions, commonly in metamorphic rocks and hydrothermal veins. The specimen has no diagnostic features for a precise geological age.

Uses & applications

Commonly sold as an inexpensive lapidary stone for cabochons, beads, carvings, massage stones, and decorative items; it has modest jewelry and collecting value.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mineral inclusions, though this piece appears weakly aventurescent or may be green quartz/quartzite. Similar material is sometimes marketed as “green jade,” but it is not jadeite or nephrite.

Field identification & locations

Identify by its green quartz-like appearance, glassy polish, hardness, and possible tiny mica flashes; it should scratch glass but not quartz. Common sources include India, Brazil, Russia, and Tanzania.