Yellow,
manganese rich elbaite with manganese-titanium intervalence charge
transfer
George R.
Rossman and Stephanie M. Mattson
Division of Geological and Planetary Sciences
California Institute of Technology, Pasadena, CA 91125, USA
Abstract
The color of yellow-green to yellow-brown Mn-rich elbaite tourmalines
from Zambia and Nepal is controlled by Fe2+ - Ti4+
(brown) and Mn2+ - Ti4+
(yellow-green) intervalence charge transfer. The proposed Mn-Ti
interaction resposible for an absorption band centered at 325 nm is
especially well developed in the Zambian tourmaline whos spectroscopic
properties are discussed.