mineral

Polished moss agate (likely)

Chalcedony, microcrystalline quartz (SiO₂), with dark mineral inclusions

AI-generated identification · may be incorrect

Rounded, polished stone with a gray-green to cream body and mossy dark inclusions; quartz hardness 6.5–7, vitreous to waxy luster, no visible cleavage, trigonal microcrystalline structure. The image alone cannot confirm the inclusion minerals or exact agate variety.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited chalcedony in cavities or fractures, with inclusions creating the moss-like pattern; formed over geological time in volcanic or other silica-bearing host rocks.

Uses & applications

Primarily used for jewelry, beads, cabochons, and collecting; agate is also used for small decorative objects.

Geological facts

Despite its name and plant-like patterns, moss agate contains no moss or other organic material.

Field identification & locations

Look for translucent-to-opaque chalcedony with natural branching or patchy inclusions and a glassy/waxy polish. Agate occurs worldwide, including India, Brazil, Uruguay, and the western United States; this small polished piece is likely worth about $2–$15.