mineral
Green aventurine (likely)
Quartz, SiO₂, with green fuchsite mica inclusions
AI-generated identification · may be incorrectTypically translucent to opaque green, with a glassy-to-waxy luster and irregular fracture; quartz hardness is about 7 Mohs, though this rough specimen may contain softer inclusions. The visible mottled green-and-white appearance is consistent with quartz mixed with mica or feldspar.
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Physical properties
Typically translucent to opaque green, with a glassy-to-waxy luster and irregular fracture; quartz hardness is about 7 Mohs, though this rough specimen may contain softer inclusions. The visible mottled green-and-white appearance is consistent with quartz mixed with mica or feldspar.
Formation & geological history
Forms when silica-rich fluids crystallize in metamorphic or hydrothermal environments, commonly in Precambrian rocks. Green color usually comes from chromium-bearing fuchsite mica or chlorite inclusions.
Uses & applications
Used as ornamental stone, carvings, beads, cabochons, and inexpensive jewelry; also collected as a mineral specimen. It is not generally used as a major construction stone.
Geological facts
Aventurine’s characteristic shimmer, called aventurescence, is caused by reflective mineral inclusions; this specimen appears too rough and inclusion-rich for strong visible aventurescence.
Field identification & locations
Identify by hardness, green quartz-like translucency, and mica sparkle; common sources include India, Brazil, Russia, and Zimbabwe. Acid produces no strong reaction, and a steel knife should not scratch clean quartz areas.
