Results 21 to 30 of about 941 (201)
Crystals, 2023 The orange fluorescence of scapolite has been confirmed to be caused by (S2)−, but the frequent blue fluorescence in gem-quality scapolite has not been well explained.
Yinghua Rao +3 more
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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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Gemological and Luminescence Characteristics of Taaffeites from Mogok, Myanmar
Minerals, 2023 Taaffeite is a rare gem that has been found in different localities such as Tanzania, Sri Lanka, China, and Mogok, Myanmar. In this study, thirty-two taaffeite samples from Mogok, Myanmar, were investigated by conventional gemological testing, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), Raman spectrometry, and fluorescence ...
Bihan Lin +4 more
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Crystals, 2023 Fluorite has been attracting the attention of gemstone mineralogists because of its rich color and excellent fluorescence properties. This paper studied fluorite with three color types (blue, green, and white) and five blue-purple fluorites with an ...
Yang Liu +5 more
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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
wiley +1 more source
Inclusions and Gemological Characteristics of Emeralds from Kamakanga, Zambia
Minerals, 2023 Currently, Zambia is one of the world’s major emerald-producing countries. In this study, emerald samples from Kamakanga, Zambia, were systematically analyzed by standard gemological tests, microscopic observation, Raman spectroscopy test of mineral inclusions, and fluid inclusions.
Zhang, Yi, Yu, Xiao-Yan
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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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Crystals, 2022 Currently, most of the popular spinels in the jewellery market come from Myanmar and Tajikistan. It is well known that provenance is one of the main factors affecting the value of a gemstone, and the geographic origin of a gemstone can be determined by ...
Yi Zhang, Jing-Ran Zhu, Xiao-Yan Yu
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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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