Montana Agate Is the name given to the beautiful chalcedony found in the alluvial gavels of the Yellowstone River and its tributaries. It is From the Pleistocene age (10,000 - 1,6000,000).
Agates in general come in many different forms and are formed in at least five different ways. The main conditions necessary for agate formation, are the presence of silica from devitrified volcanic ash, water from rainfall or ground sources, and manganese, iron and other mineral oxides that form the bands and inclusions. In Montana Agate the red is iron oxide and the black is manganese oxide.
Humanity has admired agates for thousands of years. In ancient times the beauty and durability of agate prompted man to use it in both practical and ornamental forms. It was believed that agate had unique properties that protected the wearer from dangers and
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