Citation: | ZHANG Ni, LIN Chun-ming. Review on the Application of X-ray Diffraction in Gem Identification, Synthesis and Crystal Structure Research[J]. Rock and Mineral Analysis, 2016, 35(3): 217-228. DOI: 10.15898/j.cnki.11-2131/td.2016.03.002 |
Due to the nondestructive requirements of gem testing, evaluation of precious stones shows characteristics of science and uncertainty. Gemological application of X-ray Diffraction (XRD) is specialized, with its application mainly concentrated in three aspects:① Gemstone identification:phase identification of the monocrystalline gemstones and polycrystalline gemstones; origin of the gemstones; classification of the pleomorphic gem minerals. For example, according to the XRD patterns of microcrystalline cryptocrystalline quartz variants, different silica mineral phases of the chalcedony can be distinguished accurately; types of Di in bloodstone can be distinguished through the composition and content of clay mineral. ② Research on crystal structure of the gem minerals:analysis of crystal chemistry of the monocrystalline gems with complex composition; situation of the substitution of mineral isomorphism; quality of the gem by using the degree of crystallinity. For example, through the