gemstone

Carved and polished brown agate pendant

Agate, a microcrystalline variety of quartz (SiO₂), likely chalcedony

AI-generated identification · may be incorrect

Brown, translucent-to-opaque stone with a polished surface and carved relief; quartz hardness 6.5–7 Mohs, trigonal crystal structure at microscopic scale, no cleavage, and specific gravity about 2.6. The gold-colored setting or coating is not identifiable from the image.

Identified October 15, 2026More gemstone →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids deposit successive layers in cavities, commonly in volcanic rocks; its geological age depends on the source deposit. This specimen has been cut, polished, and carved.

Uses & applications

Used as jewelry and decorative art; agate is also used for ornaments and small precision components.

Geological facts

Agate’s microscopic quartz crystals produce its toughness and polish, while banding—if present—reflects changes during silica deposition.

Field identification & locations

The carved stone appears brown and polished, but the image does not clearly show diagnostic banding, so the exact stone identification is uncertain. Agate occurs worldwide, including Brazil, Uruguay, India, and the United States.