mineral

Tumbled green aventurine

Quartz variety, mainly SiO₂ with fuchsite or other mica inclusions

AI-generated identification · may be incorrect

Typically pale to medium green, translucent to opaque, with a vitreous/waxy luster and rounded polished surface; Mohs hardness 6.5–7, trigonal crystal structure, and no prominent cleavage. The image is blurred, so identification is provisional; it could also be green quartz or jade-like material.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz containing dispersed chromium-bearing mica, usually in metamorphic or hydrothermal environments. Deposits are commonly Precambrian to younger, depending on locality.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and inexpensive jewelry; polished pieces are popular lapidary material.

Geological facts

Aventurine’s characteristic shimmer, called aventurescence, comes from reflective mica inclusions, though this specimen appears relatively low in visible sparkle.

Field identification & locations

Common sources include India, Brazil, Russia, Tanzania, and China. Field identification relies on quartz-like hardness, glassy fracture, and absence of jade’s exceptional toughness; a scratch test should be performed only on an unimportant area.