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Nomeclature of the tourmaline-supergroup minerals

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HENRY Darrell J. NOVÁK Milan HAWTHORNE Frank C. ERTL Andreas DUTROW Barbara L. UHER Pavel PEZZOTTA Federico

Year of publication 2011
Type Article in Periodical
Magazine / Source American Mineralogist
MU Faculty or unit

Faculty of Science

Field Geology and mineralogy
Keywords tourmaline nomenclature
Description A nomenclature for tourmaline-supergroup minerals is based on chemical systematics using the generalized tourmaline structural formula: XY3 Z6(T6O18)(BO3)3V3W where the common ions at each site are X = Na1+, Ca2+, K1+ and vacancy; Y = Fe2+, Mg2+, Al3+, Li1+, Fe3+ and Cr3+; Z = Al3+, Fe3+, Mg2+ and Cr3+; T = Si4+, Al3+ and B3+; B = B3+; V = OH1- and O2-; and W = OH1-, F1- and O2-. Most compositional variability occurs at the X, Y, Z, W and V sites.
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