mineral
Polished orange-and-white agate slice
Banded chalcedony, microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; orange and white bands with a waxy to vitreous luster and no obvious cleavage. The curved, polished piece appears to be agate, though its exact variety cannot be confirmed from the image.
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Physical properties
Hardness 6.5–7 Mohs; orange and white bands with a waxy to vitreous luster and no obvious cleavage. The curved, polished piece appears to be agate, though its exact variety cannot be confirmed from the image.
Formation & geological history
Agate forms as silica-rich fluids fill cavities in volcanic rock and deposit successive chalcedony bands. Its age depends on the host rock and locality.
Uses & applications
Used for jewelry, small carvings, and decorative objects; this small shaped piece is primarily a craft or collector item.
Geological facts
Agate’s fine, interlocking quartz crystals produce its characteristic banding and make it suitable for polishing.
Field identification & locations
Look for curved or concentric color bands and a hard, glassy-to-waxy surface; agate occurs worldwide, often in volcanic rocks and stream gravels. Small polished pieces commonly sell for about $2–$15 USD.
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