ncat JP328, Jahnsite, Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer Co., South Dakota, USA September 23, 2019 Steve North and Central Americas South Dakota United States
New Hampshire North and Central Americas United States 2551 Jahnsite, Palermo #1 Mine, North Groton, Grafton Co., New Hampshire, USA October 3, 2019
New Hampshire North and Central Americas United States 5507 Jahnsite, Palermo No. 1 Mine (Palermo No. 1 pegmatite; Hartford Mine; GE Mine), Groton, Grafton Co., New Hampshire, USA October 5, 2019
North and Central Americas South Dakota United States 0265 Jahnsite, White Elephant Mine, Custer Co, South Dakota, USA September 19, 2019
North and Central Americas South Dakota United States ncat JP329, Jahnsite, White Elephant Mine, Cicero Peak, Pringle, Custer District, Custer Co., South Dakota, USA September 23, 2019
