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The area becomes rich in celadonite, a soft greenish mineral.

A visit to the 14,000-acre John Day Fossil Beds National Monument in Eastern Oregon is an explosion of brightly colored rocks, paleo landscapes, sagebrush steppe, petrified tree trunks, celadonite clay bands and, of course, the fossils themselves.

The first deposit on the wall of a cavity, forming the ``skin'' of the agate, is generally a dark greenish mineral substance, like celadonite, delessite or ``green earth,'' which are hydrous silicates rich in iron, derived probably from the decomposition of the augite in the mother-rock.,