Formula: Ca(UO2)2(HSiO4).5H2O 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).