mineral
Polished pink-orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony
AI-generated identification · may be incorrectTranslucent to opaque, smooth polished surface with a waxy-to-vitreous luster; quartz hardness 6.5–7, trigonal crystal structure, no cleavage. The image does not reveal internal banding or other diagnostic features.
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Physical properties
Translucent to opaque, smooth polished surface with a waxy-to-vitreous luster; quartz hardness 6.5–7, trigonal crystal structure, no cleavage. The image does not reveal internal banding or other diagnostic features.
Formation & geological history
Chalcedony forms as silica-rich fluids fill cavities and fractures, commonly in volcanic rocks; iron oxides produce orange-red colors. Deposits form across many geological ages.
Uses & applications
Used for beads, cabochons, carvings, and decorative objects; chalcedony is also collected as a lapidary material.
Geological facts
Carnelian is a traditional variety of chalcedony, but visual identification from a small photograph is not definitive.
Field identification & locations
Look for hardness, waxy luster, and—where present—translucency or banding; common sources include India, Brazil, and Uruguay. This appears to be a small polished piece.
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