mineral
Banded agate (likely carnelian or onyx agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; cream, orange, and tan wavy bands; waxy to vitreous luster; cryptocrystalline structure and no visible cleavage. The specimen appears naturally rough or partly polished.
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Physical properties
Hardness 6.5–7 Mohs; cream, orange, and tan wavy bands; waxy to vitreous luster; cryptocrystalline structure and no visible cleavage. The specimen appears naturally rough or partly polished.
Formation & geological history
Silica-rich groundwater deposited successive chalcedony layers in a cavity, likely in volcanic rock; the precise age and locality cannot be determined from the image.
Uses & applications
Used for cabochons, beads, carvings, ornaments, and mineral collecting.
Geological facts
Agate’s distinctive bands form as silica accumulates in repeated layers; iron oxides commonly create its orange-red hues.
Field identification & locations
Look for tightly layered, curved bands and a waxy surface; agate occurs worldwide, notably in Brazil, Uruguay, India, and the western United States. A small ordinary specimen like this is typically worth about $5–$30 USD, depending on size, polish, and provenance.
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