mineral

Tumbled green aventurine

Quartz (SiO₂), typically fuchsite-bearing aventurine quartz

AI-generated identification · may be incorrect

Usually translucent to opaque green, vitreous luster, granular quartz texture, Mohs hardness 7, no prominent cleavage, and specific gravity about 2.6. The green color comes mainly from fuchsite mica or sometimes chlorite/actinolite inclusions; glittery aventurescence may be visible.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize quartz containing dispersed green mica inclusions, commonly in metamorphic or hydrothermal settings. The pictured pieces are polished/tumbled fragments rather than a distinct rock mass; age depends on locality, often Precambrian to younger.

Uses & applications

Used for beads, carvings, cabochons, inexpensive jewelry, ornamental objects, and crystal-collecting. It is also sold decoratively as “green aventurine.”

Geological facts

Aventurine is a variety of quartz defined by reflective mineral inclusions that create aventurescence; green is the most common commercial color. It is often confused with jade, but is generally softer-looking and lacks jade’s toughness and fibrous interlocking texture.

Field identification & locations

Identify by hardness, quartz-like translucency, rounded tumbled form, and occasional sparkly mica reflections; it will scratch glass but not be scratched by a steel knife. Common sources include India, Brazil, Russia, and Tanzania.