mineral
Polished banded agate (likely carnelian agate)
Microcrystalline quartz, SiO₂ (chalcedony); iron-oxide coloring
AI-generated identification · may be incorrectSmall, rounded, polished orange-brown specimen with pale curved banding and a waxy-to-glassy luster. Quartz hardness is about 6.5–7 Mohs; crystals are too fine to distinguish individually, and specific gravity is about 2.6.
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Physical properties
Small, rounded, polished orange-brown specimen with pale curved banding and a waxy-to-glassy luster. Quartz hardness is about 6.5–7 Mohs; crystals are too fine to distinguish individually, and specific gravity is about 2.6.
Formation & geological history
Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing chalcedony in bands; iron oxides produce orange tones. The image does not reveal its geological age or source locality.
Uses & applications
Used for cabochons, beads, carvings, and inexpensive jewelry or decorative objects.
Geological facts
Agate is a banded variety of chalcedony; its curved bands are characteristic of mineral deposition in successive layers.
Field identification & locations
Look for translucent chalcedony with distinct bands and a glassy or waxy surface; similar material occurs worldwide, including Brazil, Uruguay, India, and the United States. The pictured specimen appears tumbled or polished.
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