mineral

Polished banded agate (likely carnelian agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; orange-red with cream banding, waxy to vitreous luster, and no visible cleavage. The specimen appears polished and possibly carved or shaped.

Identified September 23, 2026More mineral →

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Physical properties

Hardness 6.5–7 Mohs; orange-red with cream banding, waxy to vitreous luster, and no visible cleavage. The specimen appears polished and possibly carved or shaped.

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rocks, depositing successive chalcedony layers. Its age depends on the host rock and cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and small decorative objects; also collected as a polished specimen.

Geological facts

Agate’s contrasting bands develop as silica is deposited in layers, while iron impurities commonly produce orange and red hues.

Field identification & locations

Look for translucent edges and curved or concentric bands; common sources include Brazil, Uruguay, India, and the United States. The pictured object’s exact variety is uncertain from appearance alone.