5523 Ludwigite, Spring Mountain District, Lemhi Co., Idaho, USA October 5, 2019 Steve Idaho North and Central Americas United States Ex John Sobolewski. Etched from calcite., Matt Gibbs
Scotland United Kingdom 5427 Ludwigite, Marble quarries, Kilchrist, Isle of Skye, Scotland October 2, 2019
Europe Italy ncat JP1112 Ludwigite, Onano, Latera volcano, Viterbo Province, Latium, Italy October 11, 2019
Europe Germany ncat JP0459 Ludwigite, Magnetite, Prospect 24, Pohla, Schwarzenberg District, Erzgebirge, Saxony, Germany October 11, 2019
Australasia Australia Tasmania 1516 Ludwigite, Pyroaurite-2H (Sjögrenite), Tenth Legion mine, Mt Heemskirk mineral field, Zeehan mining district, West Coast municipality, Tasmania May 10, 2025
