Previous chemical analyses of aenigmatite (Fleischer, 1936; Carmichael, 1962; Kelsey and McKie, 1964; Mitrofanov and Afanas'eva, 1966; Zies, 1966) are of phenocrysts from the pantellerites of Pantelleria, the Kola Peninsula, and Greenland, and the alkali syenites of the East Sayan Mts. The aenigmatite reported here is an interstitial mineral in the groundmass of a peralkaline trachyte, and it was analyzed to determine whether there are any significant differences between this type of aenigmatite and that occurring as phenocrysts.

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