Perkins Well No. 1, the Perkins Well No. 2, in the Green River Formation about 10 km west, and as large crystals in the Grierson Well No. 1, about 20 km northwest, Sweetwater Co., Utah
Link to MinDat.org Location Data.
Named for Rudolf Franz Johann Wegscheider (1859-1935), Austrian chemist, who first synthesized the compound.