Zeitschrift für Kristallographie - Crystalline Materials
Editor-in-Chief: Pöttgen, Rainer
Ed. by Antipov, Evgeny / Bismayer, Ulrich / Boldyreva, Elena V. / Friese, Karen / Huppertz, Hubert / Tiekink, E. R. T.
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Keatite (silica K) is tetragonal, space group P4121 (or P4321), a = 7.46 Å, c = 8.61 Å, and Z = 12 SiO2 per unit cell. Intensity measurements were made of the hk0 and hhl intensities and the structure was solved from Patterson and Fourier syntheses. The structure contains four-fold spirals of SiO4 tetrahedra which share corners. These spirals are linked together by additional tetrahedra, each of which shares its corners with tetrahedra in four different spirals.
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