mineral
Banded Agate
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
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
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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.
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