mineral
Tumbled yellow chalcedony (possibly yellow agate)
Microcrystalline quartz, SiO₂; chalcedony variety
AI-generated identification · may be incorrectSmall polished, translucent honey-yellow pebble with a waxy-to-glassy luster and no visible cleavage. Quartz hardness is 7 Mohs; chalcedony is cryptocrystalline and typically has specific gravity near 2.6.
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Physical properties
Small polished, translucent honey-yellow pebble with a waxy-to-glassy luster and no visible cleavage. Quartz hardness is 7 Mohs; chalcedony is cryptocrystalline and typically has specific gravity near 2.6.
Formation & geological history
Forms as silica-rich fluids deposit quartz in rock cavities and fractures; the specimen’s source and age cannot be determined from the image. Yellow color may be natural or enhanced by treatment.
Uses & applications
Used for beads, cabochons, jewelry, and decorative tumbling; small common pieces have modest collector value.
Geological facts
Agate is banded chalcedony, but no clear banding is visible here, so identification as agate is uncertain.
Field identification & locations
A hardness test and close inspection for fine banding can help distinguish chalcedony from other yellow stones. Chalcedony occurs worldwide, including Brazil, Uruguay, India, and the United States.
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