Samson phases a cross-reference note

In addition to the Frank-Kasper phases, other structures may be considered in which the same four types of coordination polyhedra prevail although some regularity is lost. A few notes about these phases are reported in 3.9.3.2. 

5 Chevrelphases, structures containing MefXs clusters (cross-reference note) 

The Chevrel phases are structure containing clusters as building blocks and they may be considered as phases having characteristics at the borderline between those of compounds containing molecular-like units and of solids containing infini-tively extended units. Such phases have been described in 4.4.4.7 together with Mo6X8 clusters and the products of their condensation. 

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