Etude des solutions solides des néphélines (Na,K)AlSiO4 et (Na,Rb)AlSiO4 |
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| Authors: | Jacques Roux |
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| Institution: | Centre de Synthèse et Chimie des Minéraux, C.N.R.S., rue de la Férollerie 45045 Orléans Cédex, France |
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| Abstract: | Ion exchange equilibrium of nepheline solid solutions (Na, K)AlSiO4 and (Na, Rb)AlSiO4 with hydrothermal solutions has been studied at 600°C and 2000 bars. The behaviour of dilute solid solutions was specially investigated.Na-Rb ion exchange data can be represented satisfactorily by a model taking into account the existence of two different sites in the structure of nepheline. At 600°C Rb atoms substitute almost exclusively for Na atoms situated in the larger sites. On the other hand, this model only partially applies to Na-K ion exchange equilibrium.Finally, the importance of the ion exchange data concerning extremely dilute solutions to calculate activity-composition diagrams is emphasized with special reference to the nepheline solid solutions. |
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