gemstone

Banded agate (likely carnelian or fire-agate variety)

Microcrystalline quartz, SiO₂ (chalcedony with iron-oxide bands)

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; translucent orange, red, yellow, and brown concentric banding; vitreous to waxy luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture.

Identified September 13, 2026More gemstone →

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Physical properties

Hardness 6.5–7 Mohs; translucent orange, red, yellow, and brown concentric banding; vitreous to waxy luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture.

Formation & geological history

Forms when silica-rich groundwater fills cavities in volcanic rocks, depositing successive layers of chalcedony and iron-bearing minerals. Most examples are Cenozoic to older, depending on the volcanic host.

Uses & applications

Used for cabochons, beads, carvings, ornamental slices, and small collectible specimens; fine translucent material may have modest jewelry value.

Geological facts

The curved, multicolored layers are characteristic of agate, while orange-red coloration commonly comes from iron oxides. The specimen appears naturally fractured or roughly cut rather than fully polished.

Field identification & locations

Identify by its waxy translucence, hardness, conchoidal fracture, and repeating curved bands; common sources include Brazil, Uruguay, Mexico, India, and the western United States. A glassy streak or bubbles would suggest imitation.