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TUULA, 1985: Aegirine and riebeckite of the alkali gneiss of Pikkukallio in the Honkamäki-Otanmäki region, Finland. Bull. Geol. Soc. Finland 57, Part 1-2, 169-180. Aegirine and riebeckite coexist in a Precambrian peralkaline gneiss. Chemical analyses of the gneiss and chemical and physical data on the aegirine and the riebeckite are presented. The compositions of the two minerals are compared with those of other sodic pyroxenes and alkali amphiboles from Finland. The authors know of only twodoi:10.17741/bgsf/57.1-2.014 fatcat:yxtqu4rcazgenbi63m7yfgi7jy