mineral

Polished banded agate (likely carnelian agate)

Microcrystalline quartz, chiefly SiO₂; chalcedony with iron-oxide coloring

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent orange-brown and cream concentric bands, waxy to vitreous luster, trigonal quartz structure, no cleavage. The specimen appears cut and polished, though the photo alone cannot confirm its exact variety.

Identified September 23, 2026More mineral →

Explore Polished 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 rocks, depositing successive chalcedony bands; iron oxides produce orange hues. The bands may be ancient, but the specimen’s age and source cannot be determined from the image.

Uses & applications

Used for cabochons, beads, ornaments, and small decorative objects; agate is also used in precision components and traditional stonework.

Geological facts

Agate’s curved or concentric bands record changes in mineral deposition and fluid chemistry during cavity filling.

Field identification & locations

Look for fine, curved bands and a hard, glassy-to-waxy surface; common sources include Brazil, Uruguay, India, and the United States. Similar-looking banded stones may need closer examination for precise identification.