mineral
Eye Agate
Band Chalcedony (Silicon Dioxide, SiO2)
Hardness: 6.5-7 on the Mohs scale. Color: Brownish-yellow core surrounded by white, gray, and dark concentric bands. Luster: Vitreous to waxy. Structure: Microcrystalline aggregate. Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Brownish-yellow core surrounded by white, gray, and dark concentric bands. Luster: Vitreous to waxy. Structure: Microcrystalline aggregate. Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed in cavities within volcanic or metamorphic rocks when silica-rich fluid precipitates in layers over time, creating concentric ring or 'eye' patterns.
Uses & applications
Used in lapidary work, jewelry (cabochons, beads, rings), talismanic carvings, and as a popular collectible gemstone.
Geological facts
Concentric rings in agates are often called 'eyes' and have been revered for thousands of years as protective amulets against the 'evil eye' in many ancient cultures.
Field identification & locations
Identified by its distinctive concentric, circular banding pattern and translucent to opaque silica body. Common in volcanic regions such as Brazil, Madagascar, India, and the Lake Superior region of North America.
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