mineral
Tumbled banded agate beads
Agate, microcrystalline quartz (SiO₂), a variety of chalcedony
AI-generated identification · may be incorrectPolished teal-green beads with curved, concentric banding; quartz hardness is 6.5–7 Mohs, vitreous to waxy luster, and trigonal crystal structure at the microscopic level. The color may be enhanced by dye; the image alone cannot confirm treatment.
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Physical properties
Polished teal-green beads with curved, concentric banding; quartz hardness is 6.5–7 Mohs, vitreous to waxy luster, and trigonal crystal structure at the microscopic level. The color may be enhanced by dye; the image alone cannot confirm treatment.
Formation & geological history
Agate forms as silica-rich fluids deposit successive layers in cavities, commonly in volcanic rocks. The age depends on the source deposit and cannot be determined from the beads.
Uses & applications
Used for beads, jewelry, ornaments, and small decorative carvings; agate is also collected for its distinctive banding.
Geological facts
Agate is valued for patterned chalcedony bands, which can reveal successive stages of mineral deposition.
Field identification & locations
Look for curved or concentric bands and a smooth polish; common sources include Brazil, Uruguay, India, and the United States. These appear to be small, processed beads rather than a natural in-place specimen.
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