Nomeclature of the tourmaline-supergroup minerals

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Authors	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
Citation
Web	http://dx.doi.org/10.2138/am.2011.3636
Doi	http://dx.doi.org/10.2138/am.2011.3636
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.
Related projects:	Chemical composition and structural order of natural tourmalines - geochemical versus crystal-structural constraints