Affiliation:
1. School of Gemology, China University of Geosciences, Beijing 100083, China
2. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Sciences and Technology, China University of Geosciences, Beijing 100083, China
Abstract
In recent years, “Jin Gao Yu” that has been traded as a kind of jade has appeared in areas of the Luonan and Shangnan counties, Shangluo City, Shaanxi Province, attracting the attention of scholars and consumers for its delicate texture and warm color. In this study, infrared spectroscopy, Raman spectroscopy, X-ray diffraction analysis, and electron microprobe analysis were used to conduct a systematic gemmological test and an analysis of “Jin Gao Yu”. The results show that “Jin Gao Yu” is a compact mineral aggregate dominated by dolomite, which contains quartz mineral inclusions. The color of “Jin Gao Yu” is grayish-white to earthy-yellow, the refractive index is about 1.54, and the relative density is about 2.86. Its crystal structure is basically the same as that of dolomite, both of which are trigonal systems with granular crystalloblastic textures. It has good crystallinity. The recrystallization phenomenon can be seen under a polarizing microscope. This study determined the species of “Jin Gao Yu”, improved its gemological basic data, provided a theoretical basis for the identification of “Jin Gao Yu” in the future, and, also, provided a new direction for the use of dolomite.
Funder
National Science and Technology Infrastructure—The National Infrastructure of Mineral, Rock and Fossil Resources for Science and Technology
Program of Data Integration and Standardization in Geological Science and Technology from MOST, China
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering
Reference28 articles.
1. Quantitative analysis of carbonate minerals by electron probe full element method;Zhao;Acta Geol. Sichuan,2021
2. Research progress on ordering and rheological properties of dolomite;Zheng;Geol. J. China Univ.,2020
3. Study on gemological characteristics of pink-purplish red dolomite;Chen;Superhard Mater. Eng.,2021
4. A tem microstructural study of dolomite with curved faces saddle dolomite;Barber;Contrib. Mineral. Petrol.,1985
5. A preliminary report on magnesium carbonate formation in Glacial Lake Bonneville;Graf;J. Geol.,1961