gemstone

Tumbled agate (likely moss or scenic agate)

Microcrystalline quartz, primarily chalcedony (SiO₂), with iron-oxide and possible mineral inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; rounded polished pebble with translucent gray, cream, yellow, orange, and reddish-brown zones, vitreous to waxy luster, and no obvious cleavage. The internal branching and cloudy patterns are typical of included chalcedony, though the image cannot confirm the exact variety.

Identified September 15, 2026More gemstone →

Explore Tumbled agate (likely moss or scenic agate) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Agate forms when silica-rich groundwater fills cavities in volcanic rocks, later depositing layered chalcedony and quartz over long periods, commonly during the Cenozoic or older volcanic episodes. Iron oxides produce the red, orange, and yellow colors.

Uses & applications

Used for cabochons, beads, carvings, tumbling, ornaments, and small decorative objects; attractive patterned pieces have modest jewelry and collector value.

Geological facts

Agate is a variety of chalcedony rather than a separate mineral species. Color and pattern commonly result from rhythmic silica deposition and impurities such as iron or manganese.

Field identification & locations

Identify it by its waxy translucence, hardness, conchoidal fracture, and fine banding or dendritic inclusions; it commonly occurs in volcanic terrains and river gravels worldwide. This piece appears polished and may be moss/scenic agate rather than banded agate.