metamorphic
Green aventurine (likely dyed quartzite)
Quartzite, predominantly quartz (SiO₂), colored by fuchsite mica or artificial dye
AI-generated identification · may be incorrectPolished oval cabochon with vivid translucent green color, vitreous-to-waxy luster, and cloudy inclusions. Quartz hardness is about Mohs 7; no obvious cleavage, granular crystalline structure, and specific gravity near 2.65. The unusually uniform neon-green color suggests dyeing or possibly green glass imitation.
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Physical properties
Polished oval cabochon with vivid translucent green color, vitreous-to-waxy luster, and cloudy inclusions. Quartz hardness is about Mohs 7; no obvious cleavage, granular crystalline structure, and specific gravity near 2.65. The unusually uniform neon-green color suggests dyeing or possibly green glass imitation.
Formation & geological history
Natural aventurine forms when quartz-rich sandstone recrystallizes into quartzite, commonly with chromium-bearing fuchsite mica; it is generally Precambrian to younger metamorphic material. The pictured piece has been cut, polished, and may be dyed or resin-treated.
Uses & applications
Used for cabochons, beads, carvings, and inexpensive ornamental objects; quartzite is also used as aggregate and dimension stone. This specimen has modest lapidary and decorative value.
Geological facts
Aventurine’s characteristic glitter, called aventurescence, comes from reflective mica or hematite inclusions; this cabochon appears relatively glassy with dark internal inclusions rather than strong glitter.
Field identification & locations
Check for natural mica sparkle, granular texture, and hardness; glass may show bubbles and scratches more easily. Common sources include India, Brazil, Russia, and Zimbabwe; acetone or magnification can sometimes reveal dye concentration in cracks.
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