Abstract
The crystal structure of the zincosilicate VPI-7 with the idealized chemical formula Na 32[Zn 16Si 56O 144]·40 H 2O has been refined using the Rietveld technique ( R wp = 16.2%). The analysis confirms the proposed framework topology. The true symmetry of VPI-7, however, is orthorhombic with space group Fdd2 and a = 39.88(1)A˚, b = 10.326(1)A˚, and c = 10.219(1)A˚ rather than the tetragonal symmetry ( SG/4 m2) of the structure model proposed by Annen et al. The zincosilicate framework has an intersecting 3-dimensional channel system of 8- and 9-membered rings. The most characteristic feature of the framework structure is the “spiro-5” unit of two interconnected 3MR with zinc completely ordered in each 3MR. The zincosilicate framework is one simplest end-member structure of an OD series of which the beryllosilicate Lovdarite is the other end member.
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