mineral

Polished yellow-brown agate (likely carnelian or chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

AI-generated identification · may be incorrect

Small, polished, translucent-to-opaque stone with golden-yellow and brown banding; vitreous to waxy luster. Mohs hardness 6.5–7; trigonal quartz structure, no cleavage, conchoidal fracture; specific gravity about 2.6.

Identified September 30, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited in cavities and veins, with iron oxides producing the warm colors; commonly formed in volcanic rocks over geologic time. Exact age and locality cannot be determined from the image.

Uses & applications

Used for beads, cabochons, jewelry, ornaments, and lapidary collecting.

Geological facts

Agate is a banded variety of chalcedony; iron staining can create yellow, orange, and brown patterns.

Field identification & locations

Look for fine curved bands, translucency at thin edges, and glassy/waxy polish; agate occurs worldwide, notably in volcanic regions and river gravels. The image shows a tumbled or cut piece, so precise identification is uncertain.