metamorphic
Tumbled orange aventurine (likely quartzite)
Quartz-rich rock, primarily microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectOpaque, rounded, orange-brown with a smooth polish and faint sparkle; quartz hardness is about 7 Mohs, vitreous to subdued luster, with no visible cleavage. The exact identification is uncertain from the photo; orange aventurine is commonly sold as quartzite.
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Physical properties
Opaque, rounded, orange-brown with a smooth polish and faint sparkle; quartz hardness is about 7 Mohs, vitreous to subdued luster, with no visible cleavage. The exact identification is uncertain from the photo; orange aventurine is commonly sold as quartzite.
Formation & geological history
Quartz-rich material forms through silica-rich deposition and recrystallization; quartzite develops when sandstone is metamorphosed. The specimen’s geological age and source cannot be determined visually.
Uses & applications
Commonly used for tumbling, jewelry, crafts, and decorative collections; quartzite also has construction uses.
Geological facts
The rounded shape and glossy surface indicate mechanical tumbling and polishing, which are human processing of natural geological material.
Field identification & locations
Look for a dense, quartz-rich texture and hardness sufficient to scratch glass; aventurine may show fine reflective inclusions. Orange stones sold as aventurine can be mislabeled, so identification may require testing.
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