Abstract
Samples of nepheline syenite prepared by conventional and by fluid‐energy reduction methods were studied to determine (1) their fundamental properties and (2) the characteristics they impart to vitreous bodies. Fluid‐energy grinding methods make it possible to obtain materials which pass a 325‐mesh sieve and yet do not have excessive amounts of extreme fines. The absence of large flux particles is conducive to a uniform distribution of the resultant glassy phase which permits a closer approach to equilibrium conditions and improves the physical properties of whiteware bodies.

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