Abstract
Abstract The crystal structure of manganonaujakasite was studied by single crystal X-ray analysis and infrared spectroscopy using a holotype sample with the empirical chemical formula (Na5.96Ca0.01) (Mn0.53Fe0.49)Al3.95Si8.03O26.00. The monoclinic unit cell parameters are: a = 15.029(1) A, b = 7.999(1) A, c = 10.467(1) A, β = 113.551(1)°; V = 1153.47(15) A3, space group C2/m, Z = 2. The microporous crystal structure of manganonaujakasite is similar to that of naujakasite and is based on tetrahedral [Al4Si8O26]-double layers which are linked via isolated (Mn,Fe)O6-octahedra to form a heteropolyhedral framework containing two systems of parallel wide channels. The naujakasite-type framework topologically relates to the ATV-type of AlPO4. Both are built from the same t-kah [63] and t-lov [42.62] tiles and are characterized by similar one-dimensional composite building units represented by the narsarsukite-type nsc-chain. The comparative data for the frameworks of naujakasite- and ATV-types are given.
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