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Prehnite: Structural similarity of the monoclinic and orthorhombic polymorphs and their Si/Al ordering

✍ Scribed by Werner H. Baur; Werner Joswig; Dethard Kassner; Wolfgang Hofmeister

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 370 KB
Volume: 86
Category: Article
ISSN: 0022-4596
DOI: 10.1016/0022-4596(90)90151-m

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The compounds La 3 Al 0.44 Si 0.93 S 7 , BaSm 4 (SiO 4 ) 3 Se, and monoclinic and orthorhombic Ln 2 (SiO 4 )Te (Ln ‫؍‬ Nd and Sm) were obtained accidentally by reactions in fused-silica tubes. La 3 Al 0.44 Si 0.93 S 7 crystallizes in the hexagonal space group P6 3 with two formula units in a cell of