gemstone

Red banded agate bead

Chalcedony (microcrystalline quartz, SiO₂), likely carnelian or sardonyx variety

AI-generated identification · may be incorrect

Polished, rounded bead with orange-red color and fine curved banding; typically vitreous to waxy luster, cryptocrystalline structure, no visible cleavage, Mohs hardness 6.5–7, and specific gravity about 2.6. The drilled hole and uniform polish indicate human processing.

Identified September 20, 2026More gemstone →

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Physical properties

Formation & geological history

Agate forms when silica-rich groundwater fills cavities in volcanic rock, depositing successive layers of chalcedony over long periods, commonly during the Cenozoic or older volcanic episodes. The bead was later cut and polished from the banded material.

Uses & applications

Used for jewelry, beads, carvings, ornaments, and occasionally decorative objects; it has modest value unless the banding, color, and workmanship are exceptional.

Geological facts

Red coloration generally comes from iron oxides or hydroxides. Fine parallel banding and translucency are characteristic of agate rather than ordinary glass or dyed plastic.

Field identification & locations

Check for natural irregular banding, cool feel, hardness, and a glassy-to-waxy luster; glass may show bubbles, while plastic is softer and lighter. Common sources include Brazil, Uruguay, India, Madagascar, Mexico, and the United States.