URANOPHANE (H3O)2Ca(UO2)2(SiO4)2.3H2O Monoclinic

Description: Uranophane is a bright yellow mineral formed by groundwater alteration of other uranium minerals.

MARATHON COUNTY: Found at the Summit Mine, about 3 miles NW of Wausau at the intersection of County O and U. It forms thin yellow coatings on fluorite, and K feldspar. (Weidman, 1907b, Pallen, 1963).

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