mineral
Polished brown agate or chalcedony pendant
Microcrystalline quartz (SiO₂), likely brown chalcedony/agate
AI-generated identification · may be incorrectGlossy, translucent-to-opaque brown stone, apparently tumbled or polished; quartz hardness 6.5–7, trigonal crystal structure at the microscopic level, no visible cleavage, specific gravity about 2.6.
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Physical properties
Glossy, translucent-to-opaque brown stone, apparently tumbled or polished; quartz hardness 6.5–7, trigonal crystal structure at the microscopic level, no visible cleavage, specific gravity about 2.6.
Formation & geological history
Agate forms as silica-rich fluids deposit successive layers in cavities, commonly in volcanic rocks; its precise age and locality cannot be determined from the image.
Uses & applications
Used for pendants, beads, carvings, and ornamental objects; agate is also used in precision components and decorative stonework.
Geological facts
Agate is a banded variety of chalcedony, though bands may be subtle or absent in small polished pieces.
Field identification & locations
The smooth polish and warm brown color are consistent with chalcedony, but the image does not show diagnostic banding; inspect under strong light for translucency or layers. Common sources include Brazil, Uruguay, India, and Madagascar.
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