von Knorring, O., Petersen, O. V. Karup-Moeller, S., Leonardsen, E. S. and Condliffe, E. (1992): Tuperssuatsiaite, from Aris phonolite, Windhoek, Namibia. Neues Jahrbuch für Mineralogie Monatsh., 1992, 145-152; Uwe Kolitsch (powder X-ray diffraction + SEM-EDS); [http://www.koeln.netsurf.de/~w.steffens/aris.htm]
Comments
As pseudomorphs after new hexagonal tabular Na-REE-carbonate (U. Kolitsch) and after sazhinite (U. Kolitsch). Also as typical crystals according to other sources.