Mn3+ and the pink color of gem-quality euclase from northeast Brazil

Abstract

Pink euclase of gem-quality and centimeter size, presenting an unusual pink-orange coloration and a pink to orange pleochroism, has been discovered near Livramento de Nossa Senhora, in Bahia State, Brazil. The origin of the pink coloration has been investigated using different spectroscopic techniques: UV-Vis-NIR spectroscopy, Electron Paramagnetic Resonance (EPR), luminescence and X-ray Absorption Near Edge Structure (XANES). The coloration is mainly due This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.