At the International Geological Congress in South Africa Dr. J. Morozewicz presented a paper, restating his view that the mineral nepheline has a constant composition whatever the rock in which it is formed. During the discussion Bowen pointed out objections to this view,1 basing them largely upon the wide range of composition of nephelines crystallizing from synthetic melts, but Doctor Morozewicz, granting that fact, nevertheless stoutly maintained his position that natural nepheline, when fresh, has the fixed composition represented by the formula K2Al2Si3O10.4Na2Al2Si2O8.2

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