Classification is always a highly contentious issue, particular when dealing with a group of minerals as structurally and chemically complicated as the amphiboles, and when trying to satisfy the needs and different scientific philosophies of crystallographers, mineralogists, petrologists and geochemists. As a result, the classification of the amphiboles has long been a work in progress. Leake (1968) provided a classification for calcic amphiboles, and this was expanded into the IMA (International Mineralogical Association) classification of Leake (1978). An IMA Subcommittee on Amphibole Classification was formed, and eleven years and approximately 1200 pages of memos later, Leake et al....

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