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| Mineralogical and Spectral Characteristics of Azurite Ores From Different Origins |
| XU Cui-xiang1, CHEN Yu-di2, ZOU Tao2, YANG Ying2 |
1. The Geological Museum of China，Beijing 100034, China
2. Institute of Analysis and Testing, Beijing Academy of Science and Technology (Beijing Center for Physical & Chemical Analysis), Beijing 100089, China
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Abstract Azurite is a copper-containing carbonate mineral that occurs in the oxidation zone of copper deposits. It is a secondary mineral, and its presence can serve as an indicator for searching primary copper deposits. There is relatively little spectroscopic research on azurite by domestic scholars, and the comparison of mineralogical and spectroscopic characteristics of azurite from different famous locations worldwide is an area that has not been explored. In this paper, the composition, structure, and spectroscopic characteristics of two samples of azurite from China (Liufengshan, Anhui; Yangchun, Guangdong) and two samples from foreign locations (Vietnam, Australia) were analyzed and discussed using scanning electron microscopes(SEM), X-ray diffraction (XRD), simultaneous thermal analysis (STA) and Fourier transform infrared spectrometer (FTIR). The energy dispersive elemental analysis results show that the main elements in all four mineral samples are C, O, and Cu. X-ray diffraction results indicate that, except for the sample from Liufengshan, Anhui, the X-ray diffraction phase analysis of the other three samples from different locations correspond to azurite Cu3(OH)2(CO3)2. In addition to the diffraction peaks of the main phase azurite, diffraction peaks were also detected at other positions in the sample from Liufengshan, Anhui, indicating the presence of the second phase malachite CuCO3·Cu(OH)2 in the sample. From the thermal analysis curve obtained from synchronous thermal analysis, it can be observed that there are mainly two weight loss stages. The weight loss before 300 ℃ may be attributed to the decomposition of a small amount of malachite in azurite, while the weight loss between 300 ℃ and 600 ℃ corresponds to the decomposition of azurite. The main infrared peaks observed in the infrared spectra are characteristic peaks of azurite, and the infrared spectra from the four different locations are relatively similar. Combined with the visual characteristics of azurite, this study can provide a basis for identifying and detecting azurite from different locations.
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Received: 2023-12-02
Accepted: 2024-03-19
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