mineral
Polished banded agate
Agate, a banded variety of chalcedony (microcrystalline SiO₂)
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; cream, honey-yellow, brown, and gray bands with a waxy to vitreous luster. Its microcrystalline quartz has no visible cleavage; this appears to be a polished, naturally banded piece.
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Physical properties
Hardness 6.5–7 Mohs; cream, honey-yellow, brown, and gray bands with a waxy to vitreous luster. Its microcrystalline quartz has no visible cleavage; this appears to be a polished, naturally banded piece.
Formation & geological history
Silica-rich fluids deposited successive layers in a cavity, commonly in volcanic rock; agates form across many geological ages and settings.
Uses & applications
Used for jewelry, ornaments, carvings, and collections; agate is also used for small decorative or precision objects.
Geological facts
Agate’s curved or irregular bands record changes in mineral deposition as the cavity filled.
Field identification & locations
Look for translucent chalcedony and distinct, curved bands; common sources include Brazil, Uruguay, India, and the western United States. Polishing enhances the pattern but does not establish the exact locality.
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