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The Mineralogy and Gemology Study on Malachite of Copper Oxide Belt in the ShiQing Cave in YanQin

Author: ZhangYu
Tutor: HeXueMei
School: Chinese Geology University (Beijing)
Course: Gemological
Keywords: Yanqing Azurite hole Malachite Color Genesis Structure
CLC: P57
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 0
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Abstract

In this paper, on the basis of field geological survey by polarized light microscopy, X-ray analysis, electron microprobe, X-ray powder diffraction, transmission electron microscopy, differential thermal analysis, infrared spectroscopy and other means of experimental tests, Yanqing Shiqing hole malachite color causes and structural features to do the analysis of the system, while many other major origin of malachite contrast, aimed at a better understanding of malachite, regulate the market. Yanqing malachite aphanitic structure, its structure is mainly massive and earthy structure, the massive structure of the main manifestations of the orebody. By electron microprobe, X-ray powder diffraction experiment shows that the main component of the Yanqing malachite malachite, minor minerals as well as quartz, feldspar, chalcocite, magnetite and dolomite also contains arsenic copper galena . Position derived from data obtained by electron probe test ribbon color shades, a deep ribbon color copper content of up to 1% than the light color, isomorphous as alternative zinc content therewith inversely same different shades of malachite copper content, thus deriving ribbon color saturation and tint changes with the copper content, the darker the color and tone of the high copper content, and vice versa low. By infrared spectroscopy on location test ribbon color shades, the depth and water content of the ribbon does not matter. Transmission electron microscopy and X-ray spectroscopy experiments also contains rutile in malachite and galena, electron microprobe determination cerussite, X-ray powder diffraction experiments can not cerussite, galena, and therefore The speculated Malachite both containing galena containing cerussite. Infrared spectroscopy and X-ray powder diffraction experiments, malachite contain a certain amount of water, and differential thermal experiments further validate this conclusion, comprehensive comparison found that the water content in the malachite no effect on their quality of basic. By contrast the Yanqing and other major origin malachite found, they are a major component of the same, but are very different in appearance, structure, hardness, density. Guangdong malachite with silky luster ribbon concentric structure, partially visible villous structure; Guizhou and two unknown origin malachite stripe structure; Congo radial construction aggregates, like quartz appearances clusters; Hubei nodular; Yanqing massive structure, no ribbon. Under the microscope, Congo malachite larger particles and directional strong; Yanqing malachite were fibers radial structure; not Hubei malachite grainy, irregular arrangement; Guangdong malachite unbreakable not microscope. Determination of these features provides a theoretical basis for future identifications. In this paper, on the basis of the reference previous summarized the malachite process performance and its jewelry. Further analysis based on fieldwork malachite market's current situation, and then analyzes predict its development and application prospects.

The Mineralogy and Gemology Study on Malachite of Copper Oxide Belt in the ShiQing Cave in YanQin

Abstract

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