mineral

Polished agate (likely moss agate)

Microcrystalline quartz, SiO₂ (chalcedony); possible moss-like inclusions

AI-generated identification · may be incorrect

Translucent gray-green and milky white with dark, branching inclusions and a polished luster. Quartz has Mohs hardness 6.5–7, trigonal crystal structure, no cleavage, and specific gravity about 2.6; exact identification is uncertain from the photo.

Identified September 26, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited fine quartz in cavities or fractures, with inclusions producing the branching patterns. Agate forms in many volcanic and other rocks across a wide range of geological ages.

Uses & applications

Used for cabochons, beads, ornaments, and small decorative objects; common pieces are mainly collectible rather than industrially valuable.

Geological facts

Agate is a banded or patterned form of chalcedony, and its designs arise from impurities and inclusions rather than visible large crystals.

Field identification & locations

Look for waxy luster, translucency at thin edges, and hardness sufficient to scratch glass; agate occurs worldwide, including Brazil, Uruguay, India, and the western United States. The specimen appears shaped and polished.