Yellow, Mn-rich elbaite with Mn-Ti intervalence charge transfer

Creators: Rossman, George R.; Mattson, Stephanie M.

Abstract

The color of yellow-green to yellow-brown Mn-rich elbaite tourmalines from Zambia and Nepal is controlled by Fe^(2+)-Ti^(4+) (brown) and Mn^(2+)-Ti^(4+) (yellow-green) intervalence charge transfer. The proposed Mn-Ti interaction responsible for an absorption band centered at 325 nm is especially well developed in the Zambian tourmaline whose spectroscopic properties are discussed.

Additional Information

© 1986 Mineralogical Society of America. Manuscript received August 22, 1985. Manuscript accepted November 18, 1985. We thank Peter Keller (Los Angeles) for bringing this problem to our attention; G. Becker (Idar-Oberstein), P. Flusser (Los Angeles), R. Currier (Arcadia, California), G. Moss (Sunnyvale, California), E. Foord (Denver), A. Sarosi (Los Angeles), and D. Atkinson (Santa Barbara) for providing tourmaline for study; and M. Sarosi (Ndola, Zambia), J. Petsch (Idar-Oberstein) and G. Moss for providing information about localities. J. Shigley, R. Kane, and V. Manson (Santa Monica) provided helpful discussions about their research with manganian tourmaline, and provided an exceptionally Mn-rich tourmaline of the GIA for our examination and their data and manuscript in advance of publication. Our work on intervalence charge transfer is funded in part by the National Science Foundation, Grant EAR82-12540.

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Yellow, Mn-rich elbaite with Mn-Ti intervalence charge transfer

Abstract

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