mineral

Tumbled green aventurine

Quartz (SiO₂), commonly fuchsite-bearing quartzite

AI-generated identification · may be incorrect

Hardness about 7 Mohs; blue-green to dark green, vitreous-to-waxy luster, cryptocrystalline quartz structure, and no obvious cleavage. Pale swirling or platy inclusions may be fuchsite mica; the rounded surface indicates tumbling and polishing.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Most green aventurine forms when quartzite or massive quartz contains dispersed chromium-rich fuchsite mica, crystallizing during metamorphism. Deposits are commonly associated with Precambrian metamorphic rocks, including material from India, Brazil, Russia, and Zimbabwe.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive decorative stone; it is also sold as a traditional “luck” crystal. Common tumbled pieces have modest collector value.

Geological facts

Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica or hematite inclusions; this specimen appears relatively subdued and may be quartzite or another green stone.

Field identification & locations

Identify it by its green color, quartz-like hardness, rounded polish, and occasional glittering mica flakes; it should scratch ordinary glass but not be scratched by steel. Exact identification requires microscopy or testing because dyed stones, serpentine, jade, and green chalcedony can look similar.