This chapter provides an introduction to the crystal structure, crystal chemistry and chemical composition of the amphiboles. It is not an exhaustive treatment; it is intended as an introduction to the material discussed in the following chapters. More extensive discussion of many points is given in Hawthorne (1981, 1983a), although all later developments are discussed in some detail here. Published crystal-structure refinements are listed in Appendix I.
The general chemical formula of the amphiboles can be written as
\[A\ B_{2}\ C_{5}\ T_{8}\ O_{22}\ W_{2}\]
where
Minor elements such as Zn, Ni2+, Co2+, V3+...
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