Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province
BACKGROUND Black quartzite jade is a type of commonly and commercially available jade. Many areas produce this gem. OBJECTIVES To analyze the gemological characteristics and mineral composition of the jade samples and to discuss their genesis. METHODS Conventional gemological tests, infrared spectru...
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2021-07-01
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| Series: | Yankuang ceshi |
| Subjects: | |
| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202012030155 |
| _version_ | 1797953863193460736 |
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| author | MIAO Xu SHI Miao WANG Li-sheng |
| author_facet | MIAO Xu SHI Miao WANG Li-sheng |
| author_sort | MIAO Xu |
| collection | DOAJ |
| description | BACKGROUND Black quartzite jade is a type of commonly and commercially available jade. Many areas produce this gem. OBJECTIVES To analyze the gemological characteristics and mineral composition of the jade samples and to discuss their genesis. METHODS Conventional gemological tests, infrared spectrum tests, polarizing microscopy, X-ray powder diffraction analysis, X-ray fluorescence spectrometry, and inductively coupled plasma mass spectrometry were used. RESULTS Black quartzite jade from the Linwu County, Hunan Province, showed a medium-fine grain texture. The polarizing microscopy results revealed many crytalloblastic or palimpsest textures. The content of the main mineral quartz was 44.7%, the content of secondary minerals (mica and feldspar) was 31.0%, and the content of clay minerals was 12.7%. Minor organic carbon, iron minerals, andalusite, almandine, and pyrite were also observed. CONCLUSIONS Based on the main textures, structures, configuration features, and chemical compositions, the studied samples are regarded as typical low-to-moderate temperature hydrothermal regional metamorphic rocks, which are classified as greenschist facies. The source rock was composed of sedimentary rocks abundant with aluminum, quartz, and feldspar. The tectonic environment for its formation belonged to the continental margin. This study provides technical support for the identification of the mineral composition of quartzite jades from the Linwu County, Hunan Province. |
| first_indexed | 2024-04-10T23:09:52Z |
| format | Article |
| id | doaj.art-402bbafb4e2a45a38bd08dc61cbc498f |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T23:09:52Z |
| publishDate | 2021-07-01 |
| publisher | Science Press, PR China |
| record_format | Article |
| series | Yankuang ceshi |
| spelling | doaj.art-402bbafb4e2a45a38bd08dc61cbc498f2023-01-13T06:32:59ZengScience Press, PR ChinaYankuang ceshi0254-53572021-07-0140452253110.15898/j.cnki.11-2131/td.202012030155yk202012030155Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan ProvinceMIAO Xu0SHI Miao1WANG Li-sheng2School of Gemmology and Materials Science, Hebei GEO University, Shijiazhuang 050031, ChinaSchool of Gemmology and Materials Science, Hebei GEO University, Shijiazhuang 050031, ChinaSchool of Gemmology and Materials Science, Hebei GEO University, Shijiazhuang 050031, ChinaBACKGROUND Black quartzite jade is a type of commonly and commercially available jade. Many areas produce this gem. OBJECTIVES To analyze the gemological characteristics and mineral composition of the jade samples and to discuss their genesis. METHODS Conventional gemological tests, infrared spectrum tests, polarizing microscopy, X-ray powder diffraction analysis, X-ray fluorescence spectrometry, and inductively coupled plasma mass spectrometry were used. RESULTS Black quartzite jade from the Linwu County, Hunan Province, showed a medium-fine grain texture. The polarizing microscopy results revealed many crytalloblastic or palimpsest textures. The content of the main mineral quartz was 44.7%, the content of secondary minerals (mica and feldspar) was 31.0%, and the content of clay minerals was 12.7%. Minor organic carbon, iron minerals, andalusite, almandine, and pyrite were also observed. CONCLUSIONS Based on the main textures, structures, configuration features, and chemical compositions, the studied samples are regarded as typical low-to-moderate temperature hydrothermal regional metamorphic rocks, which are classified as greenschist facies. The source rock was composed of sedimentary rocks abundant with aluminum, quartz, and feldspar. The tectonic environment for its formation belonged to the continental margin. This study provides technical support for the identification of the mineral composition of quartzite jades from the Linwu County, Hunan Province.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202012030155quartzite jademineral compositionmineralizationpolarizing microscopex-ray powder diffractionx-ray fluorescence spectrometryinductively coupled plasma-mass spectrometry |
| spellingShingle | MIAO Xu SHI Miao WANG Li-sheng Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province Yankuang ceshi quartzite jade mineral composition mineralization polarizing microscope x-ray powder diffraction x-ray fluorescence spectrometry inductively coupled plasma-mass spectrometry |
| title | Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province |
| title_full | Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province |
| title_fullStr | Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province |
| title_full_unstemmed | Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province |
| title_short | Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province |
| title_sort | mineral composition and genesis of black quartzite jade from linwu county hunan province |
| topic | quartzite jade mineral composition mineralization polarizing microscope x-ray powder diffraction x-ray fluorescence spectrometry inductively coupled plasma-mass spectrometry |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.202012030155 |
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