mineral

Eye Agate

Silicon Dioxide (SiO2) with impurities

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.

Hardness: 6
Color: Black, white, and translucent grey concentric bands
Luster: Vitreous to waxy

Identified July 1, 2026More mineral →

Explore Eye Agate in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

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.