Natural zeolites: occurrence, properties, applications by David L. Bish, Doug Ming

By David L. Bish, Doug Ming

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34 Armbruster & Gunter Figure 13. (c) The Linde Type A (LTA) framework viewed approximately along the a-axis with β-cages connected by four-membered double rings. (d) The α-cage (symmetry m3m) as found in hydrated zeolite rho (RHO). (e) The α-cage (symmetry 23) as found in pahasapaite. BeO4 tetrahedra have light rims and PO4 tetrahedra have dark rims. 781 Å, Z = 1 (Rouse et al. 1987). The structure (Rouse et al. 1989) contains ordered BeO4 and PO4 tetrahedra forming a three-dimensional array of distorted truncated cubo-octahedra or α-cages (Fig.

The Na sites (more than half occupied) are five-coordinated by three framework oxygens and two H2O molecules and occupy an eight-membered ring perpendicular to the a-axis. K (less than half occupied) is located in an eight-membered ring perpendicular to the b-axis and is coordinated by two framework oxygens and one H2O molecule. Orthorhombic symmetry occurs because of the cation distribution. SIDEWAYS Figure 10. (a) The gismondine (GIS) framework projected along the c-axis. The pseudo-41 axis is parallel to the b-axis.

Leucite undergoes a cubic-tetragonal phase transition at approximately 600°C. 0 Å, Z = 1) has a statistical (Si,Al) distribution (Peacor 1968), as in cubic pollucite and analcime (Fig. 5c). 54 Å. g. Korekawa 1969, Mazzi et al. 1976, Palmer et al. 1988). Grögel et al. (1984) and Palmer et al. (1989) suggested the formation of an intermediate tetragonal phase (space group I41/acd). The room-temperature structure of leucite was refined by Mazzi et al. 75 Å, yielding essentially the same (Si,Al) disorder as in the cubic phase.

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