mineral
Tumbled pale green aventurine or common green quartzite
Quartz, SiO₂, likely with fuchsite or chlorite inclusions
AI-generated identification · may be incorrectHardness about 7 Mohs; pale green, translucent, vitreous to waxy luster, granular crystalline structure, and no obvious cleavage. The smooth rounded shape indicates machine tumbling; visual identification alone is uncertain and could also fit serpentine or calcite.
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Physical properties
Hardness about 7 Mohs; pale green, translucent, vitreous to waxy luster, granular crystalline structure, and no obvious cleavage. The smooth rounded shape indicates machine tumbling; visual identification alone is uncertain and could also fit serpentine or calcite.
Formation & geological history
Quartz-rich material formed in metamorphic or hydrothermal environments, commonly during recrystallization of sandstone or silica-rich veins. Geological age depends on locality and cannot be determined from the specimen.
Uses & applications
Used as an inexpensive ornamental stone, bead, cabochon, and lapidary material; generally not suitable for major construction use.
Geological facts
Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mineral inclusions, though this specimen appears relatively uniform and non-sparkly.
Field identification & locations
Commonly found in India, Brazil, Russia, Tanzania, and China. Check hardness with a steel file or glass, inspect for glitter, and test density or streak; avoid acid testing unless calcite is suspected.
