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Mineral contains: Freboldite
Fleischer M (1956) New mineral names. American Mineralogist 41, 163-168
Fleischer M (1959) New mineral names. American Mineralogist 44, 906-910
Hazen R M, Hystad G, Golden J J, Hummer D R, Liu C, Downs R T, Morrison S M, Ralph J, Grew E S (2017) Cobalt mineral ecology. American Mineralogist 102, 108-116
Ramdohr P, Schmitt M (1955) Vier neue natürliche Kobaltselenide vom Steinbruch Trogtal bei Laufenthal im Harz. Neues Jahrbuch für Mineralogie, Monatshefte 1955, 133-142
Strunz H (1957) NiAs-Typus und Verwandte: Freboldit. in Mineralogische Tabellen, 3rd edition, Leipzig, Geest and Portig 98-98