Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province

MIAO Xu; SHI Miao; WANG Li-sheng

doi:10.15898/j.cnki.11-2131/td.202012030155

Rock and Mineral Analysis > 2021 > 40(4): 522-531. > DOI: 10.15898/j.cnki.11-2131/td.202012030155

MIAO Xu, SHI Miao, WANG Li-sheng. Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province[J]. Rock and Mineral Analysis, 2021, 40(4): 522-531. DOI: 10.15898/j.cnki.11-2131/td.202012030155

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Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province

MIAO Xu^1,2,,
SHI Miao^1,2, ,,
WANG Li-sheng¹

1.
School of Gemmology and Materials Science, Hebei GEO University, Shijiazhuang 050031, China
2.
Key Laboratory of Strategic Key Mineral Resources in Hebei Province, Shijiazhuang 050031, China

More Information

Received Date: December 02, 2020
Revised Date: June 17, 2021
Accepted Date: July 01, 2021
Published Date: July 27, 2021

Abstract

HIGHLIGHTS
(1) The mineral composition of black quartzite jade from Linwu County, Hunan Province, was analyzed through polarizing microscopy, powder X-ray diffraction analysis, X-ray fluorescence spectrometry, and inductively coupled plasma mass spectrometry, and the genesis of the jade was discussed.

(2) The main minerals of black quartzite jade from Linwu County, were quartz, mica, feldspar, graphite, and clay minerals.

(3) Black quartzite jade from the Linwu County, is regarded as a typical low-to-moderate temperature hydrothermal regional metamorphic rock.

ABSTRACT

BACKGROUNDBlack quartzite jade is a type of commonly and commercially available jade. Many areas produce this gem.
OBJECTIVESTo analyze the gemological characteristics and mineral composition of the jade samples and to discuss their genesis.
METHODSConventional gemological tests, infrared spectrum tests, polarizing microscopy, X-ray powder diffraction analysis, X-ray fluorescence spectrometry, and inductively coupled plasma mass spectrometry were used.
RESULTSBlack 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.
CONCLUSIONSBased 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.

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References (34)

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