Reflectance spectra of rare-earth oxides

Detailed Description
Figure 8a. Reflectance spectra of rare-earth oxides. These absorptions are due to crystal-field transitions involving deep-lying electrons of the rare-earth element and do not shift when the rare-earth ion is in another mineral. Each spectrum is offset by 1.0 units for clarity. Spectra from Clark et al. (1993b).
Sources/Usage
Public Domain.