Black Eye Agate 4mm Round - 15-16 Inch Eagle The stone's composition remains somewhat

The stone's composition remains somewhat ambiguous

and it can be mottled or striated with veins of these colors

a green-colored mineral

peach or light red and may also include colorless Quartz

second only to Diamond

Black Eye Agate 4mm Round - 15-16 Inch Eagle The stone's composition remains somewhatBlack Eye Agate is a variety of Sardonyx which has a Sard base, typically of brown or black, with bands of white Onyx running through it. Sard is not Onyx, but rather a dark variety of Carnelian. Sardonyx is sometimes treated to bring out its reddish tones. It is believed by some to improve memory and increase analytical skills.