mineral
Dyed and polished crackle agate bead
Agate, microcrystalline quartz (SiO₂), commonly artificially crackled and dyed
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; orange-red translucent body with a polygonal crackle pattern, vitreous/waxy luster, and no visible cleavage. The bead is polished and likely drilled, with coloration concentrated along fractures—typical of treated agate.
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Physical properties
Hardness 6.5–7 Mohs; orange-red translucent body with a polygonal crackle pattern, vitreous/waxy luster, and no visible cleavage. The bead is polished and likely drilled, with coloration concentrated along fractures—typical of treated agate.
Formation & geological history
Agate forms as layered chalcedony filling cavities in volcanic rocks, generally during ancient hydrothermal activity; the specimen’s exact age and locality cannot be determined visually. Crackle patterns are usually produced by heating and rapid cooling, then dyeing the fractures.
Uses & applications
Used for jewelry, beads, cabochons, ornaments, and lapidary carving; this is generally a decorative commercial bead rather than a high-value gemstone.
Geological facts
Agate is a variety of chalcedony composed of fibrous quartz. Strongly uniform neon-orange color and sharply outlined cracks usually indicate dye treatment rather than natural coloration.
Field identification & locations
Identify it by its fine quartz texture, translucency, hardness, and concentric or fracture-filled pattern; glass may show bubbles and scratches more easily. Common agate sources include Brazil, Uruguay, Mexico, India, and Madagascar.
