sedimentary
Agate Geode Slice
Silicon Dioxide (SiO2) with trace elements
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
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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.
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