mineral
Polished orange banded agate
Chalcedony, microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; translucent orange and cream bands, waxy to vitreous luster, trigonal quartz structure, no prominent cleavage. The smooth, rounded surface indicates it has been polished or tumbled.
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Physical properties
Hardness 6.5–7 Mohs; translucent orange and cream bands, waxy to vitreous luster, trigonal quartz structure, no prominent cleavage. The smooth, rounded surface indicates it has been polished or tumbled.
Formation & geological history
Agate forms as silica-rich fluids deposit successive chalcedony layers in cavities, commonly in volcanic rocks; its age varies with the host rock and can span millions of years.
Uses & applications
Used for jewelry, carvings, ornaments, and collectible polished stones.
Geological facts
Agate’s distinctive bands record changing conditions during silica deposition; orange color may be natural or enhanced by dye or heat treatment.
Field identification & locations
Identify by fine, curved or concentric bands and a hard, glassy-waxy feel; agates occur worldwide, notably in Brazil, Uruguay, India, and the western United States. A small polished piece like this typically sells for about $2–$15, depending on quality and treatment.
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