Space groups, crystal packing modes

Space Groups and Crystal Packing Modes, p. 1337 van der Waals Forces, p. 1550 X-Ray Crystallography, p. 1586... 

The internal symmetry of a crystal structure is described. The concepts of the unit cell and lattice are developed, leading naturally to a definition of symmetry elements and, hence, to the crystallographic space groups. The relevance of space groups and symmetry elements to the formation of the extended networks found in supramo-lecular chemistry is summarized. A discussion of common crystal packing modes follows, and the relevance of space group symmetry is discussed in this context. 

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