The crystal structure of yugawaralite

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Abstract
A single crystal of the rare zeolite yugawaralite, CaAl2Si6O16 · 4H2O, ha been examined by x-ray diffraction, and 1700 non-zero intensities measured A structure is proposed whose aluminosilicate framework contains 4-, 5- and 8-membered rings and shows most similarity to the heulandite family. Channels of about 3.5 Å free diameter run parallel to the a and c axes, and the Ca++ is situated at their intersection. N(z) tests have shown there is no centre of symmetry, but the framework alone possesses a pseudo-centre, which causes difficulties in the least-squares refinement.