1969 年 6 巻 1-2 号 p. 36-45
Minerals of intermediate chemical composition between analcime and wairakite are described. They were found in the highest metamorphosed part of the laumontite and mix-layer chlorite zone of the metamorphosed area in the Tanzawa Mountains, central Japan. Chemical analyses and X-ray diffraction studies were carried out on these materials. The results plotted in the Wa-Nat-Ab′ diagram indicate that the compositional variation is more extensive than reported in the past. Possible distribution of vacant fields in the diagram is also discussed.