mineral
Banded Agate (Bead)
Silicon Dioxide (SiO2, Cryptocrystalline Quartz)
AI-generated identification · may be incorrectMohs hardness 6.5–7, waxy to vitreous luster, microcrystalline trigonal structure, distinctive concentric or parallel banding in shades of tan, white, and brown.
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Physical properties
Mohs hardness 6.5–7, waxy to vitreous luster, microcrystalline trigonal structure, distinctive concentric or parallel banding in shades of tan, white, and brown.
Formation & geological history
Formed through the deposition of silica from groundwater inside volcanic rock cavities or sedimentary vesicles over millions of years.
Uses & applications
Commonly tumbled, drilled, and polished for use in jewelry, beads, cabochons, and decorative ornamental items.
Geological facts
Agate has been used as a gemstone and carved into decorative amulets since ancient Greek and Neolithic times.
Field identification & locations
Identified by its fine-grained texture, banded concentric layers, and hardness (scratches glass). This specimen is a drilled bead, not an in-situ field find.
