metamorphic
Green aventurine quartzite
Quartz-rich quartzite, mainly SiO₂, with green fuchsite mica or chlorite inclusions
AI-generated identification · may be incorrectHardness about 7 Mohs; pale to medium green, mottled white, with a granular texture and dull to slightly waxy luster. Quartz grains form an interlocking crystalline structure; cleavage is absent and fracture is uneven.
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Physical properties
Hardness about 7 Mohs; pale to medium green, mottled white, with a granular texture and dull to slightly waxy luster. Quartz grains form an interlocking crystalline structure; cleavage is absent and fracture is uneven.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized under heat and pressure, with green mica or chlorite producing the color. The specimen’s exact geological age cannot be determined visually; deposits occur in Precambrian to younger metamorphic terrains.
Uses & applications
Used as ornamental stone, cabochons, carvings, beads, countertops, and decorative aggregate; attractive pieces have modest lapidary value.
Geological facts
Aventurine quartz is distinguished from jade by its granular quartz texture and greater hardness. Strong glitter, if present, comes from reflective mica inclusions (aventurescence).
Field identification & locations
Common sources include India, Brazil, Russia, Tanzania, and China. Test with a steel file or quartz point only on an inconspicuous area; a glassy quartz-rich scratch resistance and lack of cleavage support identification.
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