Spectral Characteristic of Beryl Containing Hematite Inclusion

The beryl studied in this paper is a rare kind of beryl with hematite as the main inclusion. The detail spectral characteristics study were carried out on the samples by using LA-ICP-MS, Raman spectroscopy, IR spectroscopy and UV-Vis-NIR microscopic spectrophotometer. The samples contain a certain amount of Fe, Mn, Cs, Ti and V except the main amounts of BeO, Al₂O₃ and SiO₂, and the total amount of alkali elements is 0.48%, which belongs to alkali-poor beryl. Using the Raman spectrometer, we got the Raman shifts of I region sample parallel to c axis and vertical to c axis. Measurement of the infrared vibration frequency was performed using infrared spectrometer, acquiring the results of 3 699 cm^-1 for type I water, 3 661 cm^-1 and 3 596 cm^-1 for type Ⅱ water. With the Jasco Msv-5200, the Micro-UV-Vis-NIR spectra shows that in E⊥c direction absorption peaks at 371, 427 nm were caused by Fe³⁺; 820 nm was caused by Fe²⁺, and the 1 402, 1 835, 1 956 nm were caused by type I water and 1 369, 1 897 nm were caused by type Ⅱ water. The polarization direction of E//c shows the absorption of Fe³⁺ at 427 nm, and the absorption of type I water at 1 402, 1 467 nm; type Ⅱ water at 1 152, 1 897 nm. The strength of type Ⅱ water is stronger in the direction parallel to the c axis than that in the direction perpendicular to the c axis. The study enriches the gemmological study of this kind of beryl and lays a foundation for future research.