The crystal-chemical formula and the major-element composition of amphiboles have been discussed in Hawthorne and Oberti (2007a), and the amphibole compositional space has been defined in terms of root-names and allowed charge arrangements in Hawthorne and Oberti (2007b). Although the number of possible homovalent substitutions occurring at the various structural sites is very high, geochemically exotic cations generally do not reach the limits required to assign a distinct prefix to the root-name. Thus prefixes are so far confined to the presence of Na, K, Mg, Al, Ti, Mn, Fe, F and Cl.

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In this chapter, we examine the...

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