metamorphic
Green aventurine quartzite (probable)
Quartzite, predominantly quartz (SiO₂) with green fuchsite mica or chlorite
AI-generated identification · may be incorrectHardness about 6.5–7; pale blue-green to sea-green, granular texture, and dull to faintly sparkly luster. It appears massive with no obvious cleavage and likely has specific gravity near 2.65; the visible pale band may reflect layering or a quartz-rich vein.
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Physical properties
Hardness about 6.5–7; pale blue-green to sea-green, granular texture, and dull to faintly sparkly luster. It appears massive with no obvious cleavage and likely has specific gravity near 2.65; the visible pale band may reflect layering or a quartz-rich vein.
Formation & geological history
Formed when quartz-rich sandstone was metamorphosed and recrystallized, with green mica or chlorite producing the color; age depends on locality and cannot be determined from the image. Common sources include India, Brazil, Russia, and parts of the United States.
Uses & applications
Used for carvings, cabochons, beads, decorative stone, and lapidary specimens; quartzite is also used as aggregate and building stone. This piece appears to be a rough hand specimen rather than gem-grade material.
Geological facts
Aventurine’s characteristic aventurescence is caused by reflective mica platelets, though this specimen appears relatively low in sparkle. Green color can also result from chlorite, so laboratory testing is needed for a definitive identification.
Field identification & locations
In the field, test for glass-scratching hardness and inspect for mica glitter; acid reaction should be absent. Compare with green marble, serpentine, and dyed stone, and use thin-section or Raman/XRF analysis for confirmation.
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