Results 41 to 50 of about 15,039,014 (169)
Characterization of Blue Tourmaline from Madagascar for Exploring Its Color Origin
Advances in Condensed Matter Physics, Volume 2022, Issue 1, 2022., 2022 In the research, spectroscopic studies of tourmaline for color origin were performed by X‐ray diffraction, Fourier transform infrared spectroscopy, ultraviolet‐visible spectroscopy, and X‐ray photoelectron spectroscopy. The research work emphasized the analysis of transition metal atoms, including their valence state and coordination number, in order ...
Ming Li, Ram N. P. Choudhary
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Crystals, 2023 Green diopside is currently popular in the jewelry market due to its attractive color and excellent transparency. Gem-quality diopsides are mainly sourced from Pakistan, Italy, Russia, and other places.
Zixuan Wang +3 more
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Geochemistry, Geophysics, Geosystems, Volume 22, Issue 12, December 2021., 2021 Abstract Biominerals that accrete shell or skeleton are commonly used as windows to past geochemical environments. Using biominerals as paleoproxies depends on the assumption that biominerals faithfully and predictably record environmental parameters, yet little has been done from a mineralogical perspective to understand how various environmental ...
G. A. Farfan +3 more
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Journal of Raman Spectroscopy, Volume 52, Issue 1, Page 71-77, January 2021., 2021 Abstract Raman spectroscopy is a convenient, efficient, and non‐destructive technique that could estimate the metamictization degree of zircon, particularly for gem‐class or historical samples. The full width at half maximum value of the ν3(SiO4) band around 1000 cm−1 can classify the structural state of zircon as crystallized (the full width at half ...
Shijia Gao, Gerhard Heide
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Location characteristics of tremolite jade from Dahua, Guangxi
地质科技通报, 2021 The tremolite jade found in Dahua County, Guangxi Province, is a new type of tremolite jade that has only appeared in the past two years with a low degree of research. But the jade in this production area occupies a large share in the market.
Zuowei Yin, Wenwei Wang, Qingchao Zhou
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Mineralogical and gemological characteristics of Kaman (Kırşehir-Türkiye) fluorites
Gümüşhane Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2022 Fluorites are found in the region between Hamit, Karakütük, Bayındır and Yeniyapan villages of the Kaman District (Kırşehir-Türkiye). Fluorites are located in altered levels due to faults in quartz syenites containing gray-pink colored K-feldspar ...
İlkay Kaydu Akbudak +2 more
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Crystals, 2022 “Laoshan Jade” is located in the Yangkou area of the Sulu UHP metamorphic belt. This is the first time a systematic research study is performed on its conventional gemological characteristics, mineral compositions, geochemical characteristics, and ...
Xiaomin Yu, Yingxin Liu, Chuqi Cao
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Mineral Composition and Genesis of Black Quartzite Jade from Linwu County, Hunan Province
Yankuang ceshi, 2021 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.
MIAO Xu, SHI Miao, WANG Li-sheng
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Peridot from the central highlands of Vietnam: Properties, origin, and formation
, 2016 Vietnam is an important source of peridot for the international gem market. Gemological and geochemical characteristics of Vietnamese peridot from the Central Highlands are similar to those noted for other localities originating from xenoliths in ...
Hauzenberger C. +7 more
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Frontiers in Earth Science, 2023 The nephrite jade deposits of different tectonic units in China exert significant commercial quality, which have attracted wide attention. However, these deposits have not been systematically summarized to date.
Cun Zhang +6 more
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