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Ca2Fe3+(AlSi3)O10(OH)2 Ferriprehnite Crystal Data: Orthorhombic. Point Group: mm2. aggregates with prehnite...Z=2 X-Ray Diffraction Pattern: Kouragahana, Shimane Peninsula, Japan. 3.087 (100), 2.572 (77), 3.495...18.10 25.42 4.08 . 100.00 (1) Kouragahana, Shimane Peninsula, Japan; electron microprobe analysis, H2O...Distribution: From Kouragahana, Kitaura, Mihonoseki-cho, Matsue City, Shimane Peninsula, Shimane Prefecture, Japan...Science, Yamaguchi University (97216F cotype), Japan. References: (1) Nagashima, M., D. Nishio-Hamane