This is a very large Coymaito agate with blue and brown banding and the white bands consist of white microspheres.

It has an elongated center with three quartz openings and two are open with crystal quartz inside. There are three

hairline fractures in the bottom bands and it has a mirror polish. 

Coyamito Agate 

Rancho Coyamito, Chihuahua, Mexico

11.5 x 10.6 x 6 cm / 675 grams