Classific ation of natural tourmalines using near- infrared absorption spectroscopy
Le, Thi Mai Oanh Pham, Van Hanh Dang, Van Can Luc, Huy Hoang Six natural tourmaline crystals with different colors were investigated by near-infrared (NIR) absorption specfroscopy. The tourmaline crystals were obtained from Lucyen mines in Vietnam. The NIR absorption spectra were recorded in two ranges of 4000-5000 crn' and 6500- 8000 crnt. We found, according to their NIR spectra features, these six tourmaline crystals can be classified into four groups: Gl, liddicoatite; G2, elbaite; G3, dravite; and G4, Uvite. This grouping is consistent with the chemical composition analyses and our earlier Raman studies. Chi tiết xin mời tham khảo tại http://repository.vnu.edu.vn/handle/VNU_123/56654 Title: Classific ation of natural tourmalines using near- infrared absorption spectroscopy Authors: Le, Thi Mai Oanh Pham, Van Hanh Dang, Van Can Luc, Huy Hoang Keywords: Tourmaline;NIR absorption;OH vibration Issue Date: 2010 Publisher: H. : ĐHQGHN...