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Abstraet.The crystal structure of the new zeolite mineral gobbinsite, Cao.6Na2.6K2.2Al6Si¡o032 . 12H20, has been determined in the space groupPmn2¡ with a = 10.108(1), b = 9.766(1) and e = 10.171(1) Á. The topology of the framework is the same as that of gismondine and can be describedas a stacking of2-dimensional arrays of double crankshaft chains. The structure was refined by the Rietveld technique using X-ray powder data, and converged with RF = 0.126 and Rwp = 0.136 (statistically expectedRe = 0.121). Fifty soft restrictions on the bond distances and angles ofthe aluminosilicate framework atoms were included in the least-squares refinement as additional (geometric) observations. This facilitated the locationofthe non-framework cations and water molecules, and improved the stability of the refinement. As in the closely-related synthetic zeolite NaP2, the pseudo-tetragonal axis of the gismondine-type framework is parallelto one of the near-equivalent unit cell dimensions (c-axis), not to theunique one as expected. The arrangement of cations within the zeolitic channelssuggests an explanation for this distortion ofthe ideally tetragonal framework.

Rietveld refinement of the crystal structure of the new zeolite mineral gobbinsite