Sweetwater Agate, Agate Flats, Wyoming


This is a nodule of Sweetwater Agate, a translucent grey/blue dendritic agate found in the Agate Flats area, north of the Sweetwater River, near Jeffrey City, Freemont County, WY.  This agate is a regionally popular lapidary material, but it also shows a striking fluorescent response under UV.  The bright green short wave UV response is uranyl-activated, confirmed by the presence of numerous uranium mines in the Freemont County area.  The orange response seen under long wave UV may be Mn-activated, as suggested by the presence of the manganese oxide dendritic inclusions.  This size of this agate nodule is 54 x 40 x 26 mm, and it weighs 67 grams.

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