mineral

Banded Agate

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Translucent white with orange, red, and yellow bands. Luster: Waxy to vitreous. Structure: Microcrystalline. Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Translucent white with orange, red, and yellow bands
Luster: Waxy to vitreous

Identified July 6, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Translucent white with orange, red, and yellow bands. Luster: Waxy to vitreous. Structure: Microcrystalline. Cleavage: None (conchoidal fracture).

Formation & geological history

Formed in cavities within volcanic or sedimentary rocks where silica-rich groundwater deposits layers of chalcedony over time. Red and orange bands are caused by iron oxides (limonite or hematite).

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), collection specimens, and as a decorative landscaping stone.

Geological facts

The banding in agates reflects changes in the chemistry of the fluids filling the rock cavity during formation. No two agates are exactly alike.

Field identification & locations

Identify by looking for translucent areas and distinct parallel or concentric banding. Often found in riverbeds, lakeshores, or gravel pits in volcanic regions.