The Khur Agate Field
Khur agate field, Khur-e-Biabanak, Esfahan province
The Khur agate and geode field is located approximately 25km southeast of the Khur city, in northeast Naieen, between Tehran and Yazd. The Khur agate field in Central Iran with its fine blue agates, is my favorite agate field in Iran.
The agate and geode nodules are formed in the gas vesiculs of altered andesitic lavas which embeded in a thick altered tuff layer with lower to middle Eocene in age. This tuffaceous layer in some places altered to montmorillonite (bentonite) completely. In this localities agates and geodes find as loose
nodules on the surface. This agate field is located adjacent a bentonite clay mine which is now abandon.
General landscape of the khur agate field includes altered tuff with white to red color, that hosts nodules is located in downslope of the mounds and covered by a brown andesite lava layer. It looks like "Badland" feature at first sight. This agate field is located in the southern boarder of "Great Kavir" which is a vast salt playa in Central Iran.