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Mineral contains: Ecdemite
Nordenskiõld A E (1877) Nya mineralier från Långban. Geologiska Föreningens i Stockholm Förhandlingar 3, 376-384
Perchiazzi N, Hålenius U, Vignola P, Demitri N (2019) Crystal-chemical study of ecdemite from Harstigen, a new natural member of the layered lead oxyhalides group. European Journal of Mineralogy 31, 609-617
Perchiazzi N, Hålenius U, Demitri N, Vignola P (2020) Heliophyllite: a discredited mineral species identical to ecdemite. European Journal of Mineralogy 32, 265-273
Sillen L G, Melander L (1941) X-ray studies on the oxihalide minerals nadorite (ochrolite) PbSbO2Cl and ekdemite. Zeitschrift für Kristallographie 103, 420-430
Welin E (1968) Notes on the mineralogy of Sweden 6. X-ray powder data for minerals from Långban and the related mineral deposits of Central Sweden. Arkiv för Mineralogi och Geologi 4, 499-541