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Fe-rich “oxydravite” and dravite from the Late Proterozoic ophiolitic mélange of the Arabo-Nubian Shield, located in Egypt and Saudi Arabia, were structurally and chemically characterized by using crystal structure refinement based on single-crystal X-ray diffraction data, electron microprobe analysis, and Mössbauer spectroscopy. Structural formulae obtained by optimization procedures indicate disordering of Al, Mg, and Fe 2+  over the Y and Z sites, and an ordering of Fe 3+  at Y. The disordering can be explained by the substitution mechanisms 2 Y Mg+ Z Al+ W OH = 2 Y Al+ Z Mg+ W O 2 - and 2 Y Fe 2+ + Z Fe 3+ + W OH = 2 Y Fe 3+ + Z Fe 2+ +WO 2- , which are consistent with reducing the mismatch in dimensions between YO 6  and ZO 6  octahedra.

american mineralogist

Crystal structure analyses of four tourmaline specimens from the Cleopatra’s Mines (Egypt) and Jabal Zalm (Saudi Arabia), and the role of Al in the tourmaline group