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Sørensen, H., Danø, M., Petersen, O., Povarennykh, A., Platonov, A., Tarashchan, A. and Belichenko, V. 1971. On the mineralogy and paragenesis of tugtupite Na8Al2Be2Si8O24(Cl,S)2 from the Ilímaussaq alkaline intrusion, South Greenland. Bulletin Grønlands Geologiske Undersøgelse. 95, (Jun. 1971), 3–57. DOI:https://doi.org/10.34194/bullggu.v95.6635.