Yellow Dravite from Tanzania

George R. Rossman, Chi Ma

Division of Geological and Planetary Sciences
California Institute of Technology, Pasadena, CA 91125

Brendan M. Laurs

Encinitas, CA 92024 USA


Yellow tourmaline from the Landanai region of Tanzania was characterized. Its color arises from Fe2+–Ti4+ intervalence charge transfer. Both elements are observed in the SEM-EDS spectrum,

Yellow dravite
A faceted dravite from Tanzania, sample GRR-3265

Optical Spectrum
The optical spectrum normalized to 10 mm thickess. Data files:  E perp cE parallel c