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Agates with inclusions are some of the rarest and most beautiful agates in the world. Plume agates are a variety of chalcedony with contrasting colored, plume-like structures within the material. They usually get names such as, Graveyard Poiht Plume, from the locaion where it was found, which is in this case, Oregon.
Plume Agates are generally clear or milky with three-dimensional plant, bush or flower-like patterns or plumes floating in them. Plumes are different than dendrites, which are usually more branch-like or thin, or moss which is more mossy-like. Moss, plumes, and dendrites are usually composed of iron or manganese oxides. Often moss and plume inclusions are found together in the same rock.
Plume agate inclusions form when iron oxide, maganese oxide, or other oxides where present during the rock formation. The color of the plumes can vary depending on the material present when the rock forms, and in fact sometimes it can occur in multi-colors.