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Zeolites in Nephelinite from Hamada, Western Japan
Journal of the Mineralogical Society of Japan
Gonnardite, phillipsite and gismondine occur as euhedral to subhedral crystals in the cavities of calcareous xenolith. Thomsonite and a scolecite-like zeolite often replace nepheline crystals, and rarely fill up minute vesicles in nephelinite. The chemical analyses were made by EDS. The most Na-rich gonnardite is (Na6.61Ca1.36) ‡"7.97 [Al9.11Si10.54O40] nH2O, and the most Na-poor one is (Na5 .21Ca1.72) ‡"6.93 [A19.47Si10.47O40]¥ nH2O. Phillipsite-K and phillipsite-Ca are recognized. The formerdoi:10.2465/gkk1952.27.195 fatcat:7immmfg4cfc3fe3qdqdnlmd3h4