Because of the readiness with which it may be synthesised (Part 11) analcite (Na,O,A1,0,,4SiO2,2HZO) has been used as a starting point for preparation, in high yield, of minerals and mineral-type compounds under reproducible and relatively accessible conditions. Analcite (or leucite, Ei,O,A1,0,,4SiO2) has been converted hydrothermally into nepheline, cancrinite, nosean, sodalite, barium felspar, potash felspar, kaliophilite, kalsilite, hieratite, a-eucryptite, and various species without naturally occurring counterparts. These include, i d e v al., a lithium zeolite, T,i,O,A1,0,,2Si0,,4HZO, described in Part I, a zeolitic compound,

Ion-exchange in Crystals of Analcite and Leucite.

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