metamorphic
Raw green aventurine (likely quartzite)
Quartz-rich quartzite, chiefly microcrystalline SiO₂ with green mica/fuchsite or chlorite
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; blue-green to gray-green, mottled, with a vitreous to slightly waxy luster and granular crystalline texture. The specimen appears massive, with no obvious cleavage and irregular fracture.
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Physical properties
Hardness about 6.5–7 Mohs; blue-green to gray-green, mottled, with a vitreous to slightly waxy luster and granular crystalline texture. The specimen appears massive, with no obvious cleavage and irregular fracture.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized during metamorphism; green coloration comes from mica or chlorite inclusions. It may range from Precambrian to younger metamorphic ages depending on locality.
Uses & applications
Used as decorative stone, carvings, tumbled material, countertops, and aggregate; attractive pieces are sold as lapidary rough or cabochons.
Geological facts
Aventurine’s characteristic sparkle, called aventurescence, is caused by reflective mica platelets; this specimen appears relatively low in aventurescence and may simply be green quartzite.
Field identification & locations
Identify by its extreme hardness, granular quartz texture, green inclusions, and inability to scratch with a steel knife; common sources include India, Brazil, Russia, and Zimbabwe. Exact identification requires hardness, streak, and magnified examination.
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