mineral
Blue-green agate bead bracelet
Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue-green
AI-generated identification · may be incorrectPolished, opaque-to-translucent beads with a waxy to vitreous luster; quartz hardness 6.5–7 Mohs and trigonal crystal structure at microscopic scale. The bracelet also has gold-tone metal spacers and an ornamental charm.
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Physical properties
Polished, opaque-to-translucent beads with a waxy to vitreous luster; quartz hardness 6.5–7 Mohs and trigonal crystal structure at microscopic scale. The bracelet also has gold-tone metal spacers and an ornamental charm.
Formation & geological history
Agate forms as silica-rich fluids deposit successive layers in cavities, commonly in volcanic rocks; deposits occur worldwide and span many geological ages. The beads may have been dyed and shaped after mining.
Uses & applications
Used mainly for jewelry and decorative beads; agate is also used for carvings and ornamental objects.
Geological facts
Agate is a banded variety of chalcedony, though bands may be subtle or absent in beads. Color treatment is common in commercial agate jewelry.
Field identification & locations
Rounded polished beads and the quartz-like hardness are consistent with agate, but the image alone cannot confirm the material or dye. Common sources include Brazil, Uruguay, India, and Madagascar.
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