mineral
Eye Agate
Silicon Dioxide (SiO2) with impurities
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: Black, white, and translucent grey concentric bands; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.64.
- Hardness
- 6
- Color
- Black, white, and translucent grey concentric bands
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Black, white, and translucent grey concentric bands; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.64.
Formation & geological history
Formed through the deposition of silica from groundwater in the cavities (vesicles) of igneous rocks, such as basalt. The 'eye' patterns result from concentric layering around a central point during the cooling and mineralization process.
Uses & applications
Used primarily in lapidary arts for jewelry, beads, and cabochons. It is also an extremely popular mineral for collectors due to its unique patterns.
Geological facts
Eye agates have been used as amulets for centuries; in many cultures, the 'eye' pattern was believed to ward off the 'evil eye' or provide protection to the wearer. The most famous varieties include Lake Superior Agates and Botswana Agates.
Field identification & locations
Identify in the field by looking for a waxy luster and distinct concentric circular banding on a smooth, water-worn exterior. Often found in gravel pits or along shorelines of the Great Lakes (USA/Canada) and in volcanic regions globally.
