Results 31 to 40 of about 163 (100)
Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar
Crystals, 2023 Spinel is a common gemstone that has attracted the attention of gemologists worldwide because of its high refractive index, rich colors and brilliant hues. Myanmar is an important source of spinel. The present paper provides a systematic characterization
Lei Zhang, Kui He, Qingfeng Guo
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Diffusion of Hydroxylated Si Vacancies in Olivine, and Its Relevance to Si Diffusion
Geochemistry, Geophysics, Geosystems, Volume 24, Issue 5, May 2023., 2023 Abstract The diffusion coefficient associated with the 3,612 cm−1 infrared absorbance band in H‐bearing olivine, attributed to a defect involving a vacant Si site balanced by four H+ (i.e., ), was determined in H in‐diffusion experiments at 1200°C–1400°C and 1.5–3.0 GPa in piston‐cylinder and multi‐anvil apparatuses.
Michael C. Jollands
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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, plagioclase and quartz, amphibole and biotite type mafic minerals in the Upper Cretaceous aged.
İlkay KAYDU AKBUDAK +2 more
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Gemological Characteristic Difference between Colorless CVD Synthetic Diamonds and Natural Diamonds [PDF]
Materials, 2021 CVD synthetic diamond plays an important role in the jewelry market due to its excellent performance and low cost. In this paper, colorless CVD synthetic diamonds produced by a Chinese company were investigated in detail with their gemological, spectroscopic, and luminescent properties compared with natural colorless diamonds.
Qi Lu +4 more
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Spectroscopic Study on the Species and Color Differences of Gem‐Quality Red Garnets from Malawi
Journal of Spectroscopy, Volume 2022, Issue 1, 2022., 2022 To reveal the species of gem‐grade red garnets with similar colors, especially the mechanisms underlying their subtle color differences, a series of tests, including conventional gemological tests, X‐ray diffraction, Fourier‐transform infrared spectroscopy, ultraviolet‐visible spectroscopy, and X‐ray photoelectron spectroscopy, were performed on gem ...
Ming Li, K. S. V. Krishna Rao
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Spectroscopic Characteristics and Color Origin of Red Tourmaline from Brazil
Journal of Spectroscopy, Volume 2022, Issue 1, 2022., 2022 In the present paper, I report on the spectroscopic study for tourmaline color origin, performed red samples from Minas Geras State, Brazil, by gemological routine testing, X‐ray diffraction, Fourier transform infrared spectroscopy, ultraviolet‐visible spectroscopy, and X‐ray photoelectron spectroscopy.
Ming Li, Davidson Sajan
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Gemological Characteristics of Lvwen Stone and Its Color Genesis
Minerals, 2022 “Lvwen stone” is a yellow-green carbonate jade gemstone. In this study, the gemological characteristics and color genesis of Lvwen stone were investigated using conventional gemological testing methods and analytical techniques, such as X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–VIS ...
Zhendong Liu +10 more
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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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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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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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