mineral
Polished banded agate (possibly carnelian agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide-colored bands
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; cream, honey-orange, and white bands with a waxy to vitreous polish; trigonal quartz structure, no visible cleavage, and conchoidal fracture. Specific gravity is about 2.6.
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Physical properties
Hardness 6.5–7 Mohs; cream, honey-orange, and white bands with a waxy to vitreous polish; trigonal quartz structure, no visible cleavage, and conchoidal fracture. Specific gravity is about 2.6.
Formation & geological history
Silica-rich fluids deposited concentric chalcedony layers in cavities, commonly in volcanic rock; later polishing exposed the bands. Agate forms across many geological ages.
Uses & applications
Used for beads, cabochons, ornaments, and small carvings; also collected as a decorative specimen.
Geological facts
Agate is a banded variety of chalcedony; orange hues commonly result from iron oxides.
Field identification & locations
Look for curved or concentric color bands and a smooth, hard surface; common sources include Brazil, Uruguay, India, and the United States. The small size and polished finish suggest a tumbled or shaped piece.
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