Results 31 to 40 of about 1,737 (200)
Low-Crystallinity Index Chalcedony from Longhua, China: Characteristics and Formation [PDF]
Lithosphere, 2023 A low-crystallinity index chalcedony was found in the rhyolitic ignimbrite of the Late Jurassic Zhangjiakou Formation, located in Longhua County, Hebei Province, China.
Qiuli Yan, Guanghai Shi
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Analyzing materials in the microscopes: From the Sorby thin sections up to the nondestructive large chambers [PDF]
, 2016 Proceedings of The Fifth Saudi International Meeting on Frontiers of Physics (SIMFP2016)One hundred and sixty five years ago, Henry Clifton Sorby developed a revolutionary technique to prepare thin and polished sections of rocks and minerals to be ...
Furio, Marta +6 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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The geochemistry of gem opals as evidence of their origin [PDF]
, 2008 International audienceSeventy-seven gem opals from ten countries were analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) through a dilution process, in order to establish the nature of the impurities. The results are correlated to the mode
Bouhnik-Le Coz, Martine +6 more
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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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Crystals, 2022 With the development of synthetic gem technology, a large number of synthetic rock crystals, such as natural and synthetic amethyst and natural and synthetic smoky quartz, have emerged in the market.
Kaichao Liu, Ying Guo
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Whitby Jet Jewels in the Victorian Age [PDF]
, 2013 . During the middle nineteenth century, jet obtained from Whitby (England) was sought after due to its dark black color and hardness. This fossilized plant material was used in mourning jewelry, and Whitby hard jet was regarded among the best for carving
Brigola, João +3 more
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Crystals, 2023 The geographic origin determination of ruby is increasingly important in the gem trade and geological research. Unlike metamorphic-related ruby, the rarer basalt-related ruby has gained significant attention, especially from Thailand, a major producer of
Enqi Li, Bo Xu
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Spectroscopy and Trace-Element Characteristics of Emeralds from Kamakanga, Zambia
Crystals, 2023 Currently, Zambia is the second largest source of emeralds, after Colombia. In this study, emerald samples from the Zambian Kamakanga deposit were examined by UV-Vis-NIR, Miro-FTIR, Diamond ViewTM, and LA-ICP-MS.
Yi Zhang, Xiaoyan Yu
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Crystals, 2022 A pinkish-purple cobaltoan dolomite from the Democratic Republic of Congo (DRC) has appeared on the Chinese gemstone market recently. In this study, Raman analysis spectroscopy, Fourier transform infrared (FTIR) spectroscopy, electron probe micro ...
Ying Yan, Xiao-Yan Yu
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