mineral
Tumbled orange carnelian
Carnelian, orange chalcedony (microcrystalline SiO₂)
AI-generated identification · may be incorrectTypically Mohs 6.5–7; orange to reddish-orange, vitreous to waxy luster, cryptocrystalline quartz structure, no visible cleavage. The small polished pebble’s color and appearance fit carnelian, though identification from an image is not definitive.
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Physical properties
Typically Mohs 6.5–7; orange to reddish-orange, vitreous to waxy luster, cryptocrystalline quartz structure, no visible cleavage. The small polished pebble’s color and appearance fit carnelian, though identification from an image is not definitive.
Formation & geological history
Forms as silica-rich chalcedony in cavities and veins, often colored by iron oxides; found in volcanic and sedimentary settings. Its age depends on the host deposit and cannot be determined from the image.
Uses & applications
Used for beads, cabochons, carvings, and ornamental objects; historically popular for seals and jewelry.
Geological facts
Carnelian is a variety of chalcedony, not a separate mineral species; orange coloration is commonly associated with iron impurities.
Field identification & locations
Look for translucent orange-red color, fine texture, and hardness sufficient to scratch glass; tumbled stones have smoothed, glossy surfaces. Found in many regions, including India, Brazil, and Uruguay.
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