mineral

Polished agate (likely moss or plume agate)

Microcrystalline quartz (SiO₂), chalcedony variety; exact variety is uncertain from the photo

AI-generated identification · may be incorrect

Cream, tan, and gray chalcedony with translucent areas and possible brown-green inclusions; waxy to vitreous luster, Mohs hardness about 6.5–7, no cleavage. The rounded shape and polish indicate a processed specimen.

Identified October 1, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited chalcedony in rock cavities, sometimes trapping mineral or oxide inclusions that form plume-like patterns. Agates form in many geological settings and ages; the image alone cannot establish its source or age.

Uses & applications

Used for jewelry, cabochons, carvings, and decorative or collectible stones.

Geological facts

Agate is banded or patterned chalcedony, and its colors and internal markings can vary greatly even within one specimen.

Field identification & locations

Look for translucence, waxy luster, and curved or plume-like internal patterns; hardness and appearance help distinguish it from softer imitations. Agate occurs worldwide, including Brazil, Uruguay, India, and the western United States.