Nomenclature of the tourmaline-supergroup minerals by Darrell J. Henry, Milan Novák, Frank C. Hawthorne, Andreas Ertl, Barbara L. Dutrow, Pavel Uher, and Federico Pezzotta (May-June, vol. 96, p. 895-913, 2011: Article DOI: http://dx.doi.org/10.2138/am.2011.3636. Erratum DOI: http://dx.doi.org/10.2138/am.2013.614.)

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For the purposes of classification of tourmaline species only, the ordered form of the tourmaline is assumed for all tourmaline species including the oxy-tourmaline. Consequently, the procedure that is recommended for classification involves allocation of the small cations among the Z and Y sites as follows: Initially assign the most abundant R3+ cations to the Z site (not including any Al...

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