Lattice secondary valence type

These include, notably, the layer lattices which cohere in two directions by primary valences and in the third by secondary valences examples, which we shall later discuss in greater detail, are Cdl2, M0S2, Asis, talc, graphitic acid and siloxene. The anisotropy of the linkage type is very markedly expressed in them by the laminar habit and by the mechanical properties. To this type belong also reticulate filamentous lattices such as exist in vulcanized rubber and in numerous synthetic high polymers. 

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