mineral
Tumbled green aventurine (likely)
Quartz, SiO₂, with fuchsite or other green inclusions
AI-generated identification · may be incorrectOpaque to translucent green, waxy-to-glassy luster, no visible cleavage, conchoidal fracture, and Mohs hardness about 6.5–7; rounded surfaces indicate tumbling. The pieces may also be nephrite jade, serpentine, or colored glass, so image-only identification is uncertain.
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Physical properties
Opaque to translucent green, waxy-to-glassy luster, no visible cleavage, conchoidal fracture, and Mohs hardness about 6.5–7; rounded surfaces indicate tumbling. The pieces may also be nephrite jade, serpentine, or colored glass, so image-only identification is uncertain.
Formation & geological history
Quartz-rich material forms in hydrothermal veins or metamorphic rocks, with green mica inclusions producing aventurine color; deposits are commonly Precambrian to younger. Tumbling is human processing, not natural weathering.
Uses & applications
Used for inexpensive cabochons, beads, carvings, ornaments, and decorative stone; not typically used as a major construction aggregate.
Geological facts
Aventurine’s glitter, called aventurescence, comes from reflective mineral inclusions, though these specimens appear relatively non-sparkly. A scratch test, refractive-index test, or microscopy is needed for confirmation.
Field identification & locations
Common sources include India, Brazil, Russia, and China. Look for subtle mica sparkle, uniform quartz-like hardness, and cool stone feel; glass often shows bubbles, while jade is tougher and typically more fibrous.
