mineral
Green aventurine (likely)
Quartz, SiO₂, containing fuchsite mica or other green inclusions
AI-generated identification · may be incorrectPale green, granular and opaque to translucent, with a vitreous-to-waxy luster and possible subtle glitter; quartz hardness is about 7 Mohs, with no cleavage and irregular fracture. The pictured piece may also be a green-bearing metamorphic rock rather than pure aventurine.
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Physical properties
Pale green, granular and opaque to translucent, with a vitreous-to-waxy luster and possible subtle glitter; quartz hardness is about 7 Mohs, with no cleavage and irregular fracture. The pictured piece may also be a green-bearing metamorphic rock rather than pure aventurine.
Formation & geological history
Aventurine forms when silica-rich fluids crystallize quartz around microscopic mica inclusions, commonly in metamorphic or hydrothermal settings; its exact age depends on locality. The specimen’s origin and geological age cannot be determined from the image alone.
Uses & applications
Used as a lapidary stone for carvings, beads, cabochons, and decorative objects; lower-grade material is sold as ornamental rough. It has limited industrial value compared with ordinary quartz.
Geological facts
Green color and aventurescence commonly result from fuchsite, a chromium-rich muscovite; hematite or goethite can produce red or brown varieties. Color alone is insufficient for reliable identification.
Field identification & locations
Look for quartz-like hardness, granular texture, and sparkly mica reflections; it should scratch glass but not be scratched by a steel knife. Common sources include India, Brazil, Russia, and Tanzania; acid testing is generally unhelpful.
