Mineralogical Characteristics Study of Calcite from the Fujian Province, China

Abstract

With mineral in situ testing technology and ore deposit geochemistry development, calcite has become a hot topic in studying carbonate minerals. Four large-grain calcite crystals from Fujian, China, were used for a detailed study. This study provides a comprehensive data set through mineralogical standard properties and spectral characteristics, including Fourier transform infrared, X-ray fluorescence spectrum, and Raman spectroscopy. Major elements were analyzed using X-ray fluorescence (XRF) and Micro-XRF. A high-resolution gas-source stable isotope ratio mass spectrometer was used to test C-O isotope characteristics. The four samples’ spectral characteristics and phase composition show excellent uniformity, all with the same characteristic peaks, indicating that they are pure calcite without other impurity minerals. C-O isotope characteristics indicate that Fujian calcite has mantle genetic characteristics, which may be affected by marine carbonate dissolution or sedimentary rock contamination. The variation of Fe and Mn contents may indicate that the four samples formed at different metallogenic stages.

Mineralogical and spectral characteristics of Changbai jade, Jilin province, Northeast China

“…Spectrometry was used to analyze the chemical composition of samples CB21 and CB22, as shown in Table 1. Based on the results of thin section analysis, the main mineral composition of both samples is dickite, whose mineral chemical formula is Al 4 [Si 4 O 10 ](OH) 8 (Yuan et al, 2022) and the theoretical chemical composition of it is w (Al 2 O 3 ) = 38.1%-39.8%, w (SiO 2 ) = 45.5%-46.1%, and w (H 2 O) = 13.5% (Zhao et al, 2023), where H 2 O represents both adsorbed and structural water. The main components of the tested samples are SiO 2 and Al 2 O 3 , with SiO 2 content at 43.23% and 45.70%, and Al 2 O 3 content at 41.59% and 39.29% for samples CB21 and CB22, respectively, which are consistent with the theoretical values.…”