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Journal of Petrology | Volume 1 | Number 1 | Pages 56-72 | 1960
© Oxford University Press 1960

research-article

Nepheline Solid Solution in the System NaAISiO4–KAISiO4–SiO2

D. L. HAMILTON and W. S. MACKENZIE

Department of Geology, The University Manchester, England

ABSTRACT

The limit of solid solution of SiO2 in nephelines has been determined at 700° C and a water pressure of 15, 000 lb/sq. in. X-ray data are given for the determination of the composition of nephelines in equilibrium with alkali feldspar at 700° C.

The break in the plot of lattice parameters against chemical composition for nephelines in the system NaAISiO4–KAISiO4 (Tuttle & Smith, 1958) is found to persist in the ternary system and occurs when six out of the eight alkali atom sites are filled by Na.


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