mineral

Tumbled green aventurine

Quartz (SiO₂) with fuchsite or mica inclusions

AI-generated identification · may be incorrect

Usually pale to medium green, translucent to opaque, with a vitreous luster and subtle glitter; hardness about 6.5–7 Mohs, trigonal crystal structure, no prominent cleavage, and specific gravity near 2.65. The rounded, glossy shape indicates tumbling and polishing.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Aventurine forms when silica-rich fluids crystallize quartz containing dispersed green fuchsite mica, chlorite, or occasionally other minerals; deposits are commonly associated with metamorphic and hydrothermal rocks. Its exact geological age depends on locality, commonly Paleozoic to younger.

Uses & applications

Used for carvings, beads, cabochons, ornamental stone, and inexpensive jewelry; polished pieces are also sold as decorative or metaphysical specimens.

Geological facts

The green color and aventurescence come mainly from chromium-bearing fuchsite mica, though this specimen shows only weak glitter. It is commonly confused with jade, but aventurine is generally harder and lacks jade’s dense fibrous or granular texture.

Field identification & locations

Identify by its quartz-like hardness, glassy polish, green body color, and occasional sparkles; it should scratch glass but not quartz. Common sources include India, Brazil, Russia, Tanzania, and China.