Framework structures, which feature three-dimensional networks of relatively rigid polyhedral units that share corners with one another, encompass a wide range of natural and synthetic compounds of importance in the Earth sciences, solid state chemistry, condensed matter physics, and materials sciences. Many frameworks consist entirely of corner-sharing tetrahedra such as SiO4, AlO4, BeO4 and PO4. Examples include phenakite, major crustal-forming groups of minerals such as the feldspars, feldspathoids, most of the silica polymorphs, as well as technologically-important groups of compounds such as zeolites. Other frameworks incorporate network-forming tetrahedra and octahedra and include the...
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