Paulingite

Abstract: A new zeolite, for which the name paulingite is proposed, has been found in vesicles in basalt from the Columbia River near Wenatchee, Washington. Paulingite is cubic, and occurs as perfect, transparent rhombic dodecahedra. The very large cubic cell has oo:35.10 + .O2 4,, and the space group is probably Ons Im3m. Ca and K are the chief cations, but Ba and Na are also present. The atomic ratio of Si to Al is roughly 3. In association with the paulingite is the rare zeolite erionite. It occurs as relatively large acicular hexagonal prisms, and also as tufts of very fine fibers. The hexagonal unit cell has dimensions o: 13.27 +.02 A, c:15.05 +.02 A, and the space group is either Dan4, Cua, or D:r,a. Erionite is a member of the chabazite group of zeolites. Also in association with the paulingite and erionite is pyrite of remarkable filiform habit.

Abstract: A sample of the zeolite paulingite from the locality Vinaricka Hora was investigated by means of chemical, thermal, powder and single crystal X-ray methods The fully transparent, colourless to pale yellow crystals exhibit the form {II O} and occur together with phillipsite The chemical composition is (Cazs7K22sBal3yNao3s)(AIll5sSi3os9084)27H20, 2 = 16 with minor amounts of Mg «005), Sr «013), Mn «00 I), and Fe «004) The chemical differences from previously described paulingites are a high Bacontent, a lower Si/(Al+Fe) ratio of 264, and a reduced water-content The calculated density is 2098 g cm-3, and the observed refractive index is 1482(2) The dehydration behaviour is characterized by a main weight loss from 24-190°C (-I 12 wt %, ~ 21 H20) and a minor weight loss from 190- 390°C (-31 wt %, ~ 6H20) The rehydration capability was proven up to 150°C The dehydration process during the main weight loss is accompanied by a reduqion of the cell volu~e of II % The refined lattice parameters of the X-ray powder data are a =351231 (5) A and a =337485(8) A of an untreated and a dehydrated sample, respectively A breakdown of the paulingite structure can be observed while the remaining water content decomposes The single crystal X-ray refinement of this chemically different sample material derived three main cation positions, which are inside a so called paulingite or 1t-cage (Ca), between 8-rings of neighbouring 1t-cages (Ba), and in the centre of the non-planar 8-rings of the y-cage (K) Further partially occupied cation positions (Ca,Na) were located in the planar 8-rings of the r:J-and y-cages No positions within the double 8-membered rings were detected The water is localized around the main cation positions and in three clusters of partially occupied sites

Abstract: By means of the concept of universal optimum and general principles of inorganic gene, structures of paulingite-related zeolites and minerals have been constructed The structures of zeolite Rho and paulingite are considered as members of zeolite family generated by the work of 4-colored cellular automaton (CA) The ideal symmetry of the members of the family is cubic, space group \( Im\overline{3}m \), a = 15 + 10n [A], where n is a number of the CA cycle (n = 0 for zeolite Rho and 2 for paulingite) A new hypothetical zeolite of the family with n = 1 is predicted and named ISC-1 (Institute of Silicate Chemistry-1); atomic coordinates and theoretical X-ray powder diffraction pattern have been calculated It appears to be very probable that universal optimum contains all necessary information for its material realization (sharp configurations) and construction of materials with certain type of interaction potential (even with restrictions existing in theory for this potential)