mineral

Tumbled green aventurine

Quartz aggregate, predominantly SiO₂, with fuchsite mica inclusions

AI-generated identification · may be incorrect

Usually pale to medium green, opaque to translucent, with a vitreous-to-waxy luster and subtle aventurescence; hardness about 6.5–7 Mohs, no prominent cleavage, and granular cryptocrystalline structure. The rounded, polished form indicates commercial tumbling.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize as quartz containing dispersed green fuchsite or chlorite; most material is Precambrian to Paleozoic in age, depending on locality. Common sources include India, Brazil, Russia, and Tanzania.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive jewelry; also sold as a decorative healing stone. It has little industrial value compared with ordinary quartz.

Geological facts

Aventurine’s characteristic shimmer—aventurescence—comes from reflective mica platelets, though this specimen appears relatively low-glitter. It is commonly confused with jade, which is generally tougher and has a different fibrous texture.

Field identification & locations

Identify by its green quartz body, glassy polish, occasional mica sparkle, and ability to scratch glass while resisting a steel knife. Confirmatory testing requires hardness, specific gravity, and microscopy; visual identification alone is not definitive.