Schroeckingerite NaCa3(UO2)(CO3)3(SO4)F·10H2O, is a secondary uranium mineral named in honor of J. von Schroeckinger, who found (Schrauf, 1873) and later described (Schroeckinger, 1875) the occurrence at Joachimsthal, Bohemia. It since has been reported from a number of localities, including several in the United States. In the Western United States it is found in Sweetwater and Carbon Counties, Wyoming (Larsen and Gonyer, 1937; Vine and Prichard, 1954); in Yavapai County, Arizona (Axelrod et al., 1951); in Grand, San Juan, Emery and Piute Counties, Utah (Weeks and Thompson, 1954; Gruner et al., 1954). It has been reported as occurring in the Ambrosia Lake, New Mexico uranium district by Towle and Rapaport (1952) and Rapaport (1952). This occurrence later was disputed by Gruner et al. (1954), who stated the mineral identified as schroeckingerite actually was meta-autunite. The most recent papers on uranium mineralogy in the Ambrosia Lake area (Corbett, 1963) (Granger, 1963) do not mention schroeckingerite as one of the secondary minerals present in that area.

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