An arsenatian variety of Marcasite.
First reported from Churprinz Friedrich August Erbstolln Mine (Churprinz Mine; Kurprinz Mine), Großschirma, Freiberg District, Erzgebirge, Saxony, Germany.
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(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.