mineral
Polished agate (likely moss agate)
Microcrystalline quartz, SiO₂ (chalcedony); possible moss-like inclusions
AI-generated identification · may be incorrectTranslucent 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 More mineral →
Explore Polished agate (likely moss agate) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
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.
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.
