George R. Rossman
Division of Geological and Planetary SciencesCalifornia Institute of Technology, Pasadena, CA
Blue Elbaite from Mt. Marie
The blue color of the elbaite from Mt. Marie results from the presence of Fe2+ and the absence of Ti4+ coupled with a small amount of Fe3+. The green color results from Fe2+ (with little or no Fe3+) interacting with a small amount of Ti4+.
Absorption spectrum: Graph of blue - 1 mm thick.
Data: E perpendicular to c, E parallel to c
