Abstract
A study, by optical, X-ray powder diffraction, spectrographic and chemical methods of the eudialyte-eucolite group minerals from the nepheline syenite pegmatite in the Langesund area of Norway showed that they are optically negative eucolites, as found byBrogger (1890), a common major element composition is established. This corresponds closely to optically positive eudialytes calculated on the basis of atoms per unit cell as proposed byGiuseppetti, Mazzi andTadini (1971). Specific gravity and refractive indices vary in accordance with Ce, Nb and minor element concentrations indicating that the studied minerals are members of an isomorphous series. The trace element and REE conposition of the eucolites is consistent with a nepheline syenite pegmatite origin.
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