ncat JP2341, Robertsite, White Elephant Mine, Cicero Peak, Pringle, Custer District, Custer Co., South Dakota, USA September 23, 2019 Steve North and Central Americas South Dakota United States
North and Central Americas South Dakota United States 5533 Robertsite, Montgomeryite, Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA October 5, 2019
