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Gonnardite is a comparatively rare, fibrous zeolite, natrolite subgroup. Older papers claim that a complete solid solution exists between tetranatrolite and gonnardite, but tetranatrolite was discredited as a separate species in 1999.〔American Mineralogist (1999) 84: 1445-1450〕 A series, based on the disorder of the silicon-aluminum in the framework, appears to exist between Na-rich gonnardite and natrolite, Na2(Si3Al2)O10·2H2O.〔Tschernich, Zeolites of the World (1992) Geoscience Press, pages 215 to 225〕 Gonnardite was named in 1896 after Ferdinand Pierre Joseph Gonnard〔http://www.minrec.org/labels.asp?colid=1316〕 (1833–1923), who was Professor of Mining Engineering at the University of Lyon, France. ==Crystallography== Orthorhombic-bipyramidal class 2/m 2/m 2/m and tetragonal-scalenoidal class 2m (orthorhombic with a very close to b, or tetragonal with a equal to b). Unit Cell Parameters: a = b = 13.21 Å, c = 6.622 Å, Z = 2 〔〔〔Mineralogical Magazine (1998) 62: 548〕 Space Group: I2d 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gonnardite」の詳細全文を読む スポンサード リンク
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