Zeolite-Type Crystal Structures and their Chemistry. Framework Type Codes RON to STI

When the first volume of this compilation was published in 2000 (subvolume B of volume 14 of the Physical Chemistry, Group IV, of Landolt-Börnstein) we knew of 130 framework-type codes approved by the Structure Commission of the International Zeolite Association. At that point we had identified and collected in our databank Zeobase more than 1800 sets of individual crystal structure data concerning zeolites. We expected it would take three volumes to cover all this ground. As of this writing there are 186 known framework-type codes and the number of individual entries is close to 4900. That means that on average close to 400 new crystal structure determinations or refinements of zeolites have been published annually since the year 2000. This, fourth, subvolume E contains information on the 30 framework-type codes from RON to STI, encompassing 1100 individual entries, of which 949 are for the SOD-type alone. With 152 pages the SOD-chapter comprises more than a third of this volume. It is the most studied zeolite framework and is exceedingly complex in terms of its varied chemistry and especially in the richness of the various space group symmetries in which it has been found to occur. At least 27 different space groups have been used to describe the SOD-types known so far. No other zeolite-type displays such variety. Possibly this is due to the collapsibility and flexibility of its simple framework.