gemstone

Polished yellow-green agate

Chalcedony, microcrystalline quartz (SiO₂), likely banded agate

AI-generated identification · may be incorrect

Translucent yellow-green with pale curved bands and a polished, waxy-to-glassy luster; quartz hardness 6.5–7, trigonal crystal structure at the microscopic scale, with no visible cleavage. Exact variety is uncertain from the photo.

Identified October 4, 2026More gemstone →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids deposit chalcedony in cavities, commonly in volcanic rocks; its geological age depends on the host deposit and cannot be determined from appearance alone.

Uses & applications

Used for cabochons, jewelry, ornaments, and lapidary collections.

Geological facts

Agate’s bands record successive silica deposition and may form intricate patterns visible when cut and polished.

Field identification & locations

Look for translucency, curved or concentric bands, and hardness greater than glass; common sources include Brazil, Uruguay, India, and the United States. Similar dyed or treated agates are also sold, so appearance alone cannot establish origin or treatment.