mineral

Eye Agate (Sulemani Agate)

Banded Chalcedony (SiO2)

Hardness: 6.5-7 Mohs; Color: Black, brown, and white concentric bands; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Specific gravity: 2.58-2.64

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

Identified February 20, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Black, brown, and white concentric bands; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Specific gravity: 2.58-2.64

Formation & geological history

Formed within volcanic rock cavities (vesicles) where silica-rich fluids deposit layers over thousands of years, creating concentric patterns. Found in Tertiary or Cretaceous aged basaltic formations.

Uses & applications

Primarily used in jewelry for cabochons, rings (like the one pictured), amulets, and by collectors for its aesthetic patterns. Used in traditional meditation and spiritual practices.

Geological facts

This specific pattern is often called the 'Evil Eye' or 'Sulemani Agate' in South Asia and the Middle East, believed to offer protection and ward off negative energy. It is a variety of chalcedony.

Field identification & locations

Identified by concentric 'bullseye' banding visible when cut and polished. Common locations include India, Brazil, Yemen, and Uruguay. Field identification involves checking for hardness (won't scratch with a steel knife) and waxy luster.

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