Relationship between the Coloration Mechanism and Gemological Properties of Purple Scapolite
Crystals, 2023 Purple scapolite is a precious gemstone. In this paper, we compared the crystal structure and spectral characteristics of purple scapolite before and after heat treatment with conventional gemological tests, EPMA, XRF, LA-ICP-MS, infrared spectroscopy ...
Yinghua Rao +3 more
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The Gemological Characteristics of Chinese Peridot
Gems & Gemology, 1986 Figzzre 1. Two of the rough peridot nodrlles froin Chino that were used in this study. The larger measures 20.6 x 13.7 x 10.1 m m and weighs 23.71 ct. Photo O Tino Hammid. found in San Carlos, Arizona, which also occurs in basalt (Koivula, 1981)) no well-formed single crystals of rough peridot have been found in the Chinese deposits.
C. W. Fryer, John I. Koivula
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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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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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Chapter Il disegno delle gemme sfaccettate. Fonti iconografiche e trattatistica, analisi geometrica, rilevamento, modellazione parametrica [PDF]
, 2022 The 43rd UID conference, held in Genova, takes up the theme of ‘Dialogues’ as practice and debate on many fundamental topics in our social life, especially in these complex and not yet resolved times.
Argenziano, Pasquale +2 more
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Garnet: Witness to the Evolution of Destructive Plate Boundaries [PDF]
, 2013 Thanks to its unique chemical and mechanical properties, garnet records evidence of rocks\u27 paths through the crust at tectonic plate boundaries. The compositions of garnet and coexisting mineral phases permit metamorphic pressure and temperature to be
Caddick, Mark J., Kohn, Matthew J.
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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
doaj +1 more source
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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Merelaniite, Mo4Pb4VSbS15, a New Molybdenum-Essential Member of the Cylindrite Group, from the Merelani Tanzanite Deposit, Lelatema Mountains, Manyara Region, Tanzania [PDF]
, 2016 This is an open access publicationThis is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY
Harrison +12 more
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Caracterização Gemológica das Turmalinas de Quixeramobim [PDF]
, 2020 A caracterização gemológica de minerais permite a avaliação de gemas naturais, sintéticas, orgânicas e artificiais quanto à sua qualidade gemológica, incluindo descrição de características referentes a sua densidade, dureza, cor e composição química.
Carneiro, Laryssa de Sousa +4 more
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