mineral

Tumbled banded agate (likely carnelian agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloring

AI-generated identification · may be incorrect

Smooth, opaque peach-orange pebble with a subtle gray-white band. Quartz hardness 6.5–7 Mohs; waxy to vitreous luster; trigonal quartz structure, with no visible cleavage and conchoidal fracture when broken. Specific gravity about 2.6.

Identified October 13, 2026More mineral →

Explore Tumbled banded agate (likely carnelian agate) in the encyclopedia →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rock, depositing chalcedony in successive bands; iron impurities create orange hues. The specimen’s precise geological age and source cannot be determined from the image.

Uses & applications

Used for jewelry, beads, cabochons, and decorative objects; common tumbled pieces are primarily collectible or ornamental.

Geological facts

Agate is a banded variety of chalcedony, and its color bands record changes during silica deposition.

Field identification & locations

Look for fine, curved or parallel bands and a waxy, very smooth surface; the specimen appears polished and may be dyed or otherwise treated. Agates occur worldwide, especially in volcanic regions and stream gravels.