mineral
Polished orbicular agate beads
Microcrystalline quartz (SiO₂), chalcedony with orbicular banding
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; cream, honey-yellow, and brown patterns with a waxy-to-glassy polish. Trigonal quartz in microcrystalline form; no visible cleavage, conchoidal fracture when unworked; specific gravity about 2.6.
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Physical properties
Hardness 6.5–7 Mohs; cream, honey-yellow, and brown patterns with a waxy-to-glassy polish. Trigonal quartz in microcrystalline form; no visible cleavage, conchoidal fracture when unworked; specific gravity about 2.6.
Formation & geological history
Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing chalcedony in layers or rounded growths. The exact geological age and locality cannot be determined from the image.
Uses & applications
Cut and polished for beads, cabochons, ornaments, and collectible specimens; agate is also used for small decorative objects and historically for tools and seals.
Geological facts
The rounded cream markings are orbicular patterns, produced by localized mineral growth or replacement within chalcedony.
Field identification & locations
Identify by its hardness, waxy luster, and distinctive, often concentric or rounded patterns; common sources include Brazil, Uruguay, India, and Madagascar. These appear shaped and polished, likely for jewelry.
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