sedimentary

Agate Geode Slice

Silicon Dioxide (SiO2) with trace elements

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: White, gray, and blue-gray bands; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture.

Hardness: 6
Color: White, gray, and blue-gray bands
Luster: Vitreous to waxy

Identified July 2, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: White, gray, and blue-gray bands; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture.

Formation & geological history

Formed as secondary deposits in volcanic rock cavities (vesicles) or sedimentary limestone. Periodic mineral deposition from silica-rich groundwater creates the characteristic banding.

Uses & applications

Used primarily for jewelry, lapidary arts, decorative home accents, and crystal healing collections.

Geological facts

Agates are named after the Achates River in Sicily where they were first found. Every agate geode slice is unique due to the random nature of mineral deposition over millions of years.

Field identification & locations

Look for distinctive concentric banding and a translucent center. Commonly found in riverbeds or volcanic fields. Collectors look for high contrast in the bands and lack of cracks.