Results 51 to 60 of about 941 (201)
Aspectos Gemológicos de Ametistas de Quixeramobim, Brasil [PDF]
, 2021 Desde o final do século XX tornou-se extremamente comum que os países com uma exploração significante de gemas, cataloguem e divulguem as propriedades de suas gemas para diversos fins, como por exemplo mercadológicos, acadêmicos ou criminalísticos.
Dos Santos, Lucilene +5 more
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Mineralogical-Petrographical Investigation and Usability as the Gemstone of the North Anatolian Kammererite, Tokat, Turkey [PDF]
, 2020 Kammererite formations were observed in the region of Tokat province in the north of Anatolia. Kemmererite (purple, reddish, pink color) is present in the form of nodules or veins in chromium levels found in Mesozoic basic-ultrabasic rocks.
Akbudak, İlkay Kaydu +2 more
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Gemological and Chemical Characterization of Gem-Grade Peridot from Yiqisong, Jilin Province
CrystalsPeridot has a long history and is deeply loved by people for its unique olive-green color. The Yiqisong peridot deposit in Jilin Province is a newly discovered peridot deposit that still deserves systematic research.
Jina Li, Yi Zhao, Bo Xu
doaj +1 more source
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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CrystalsSpodumene is a characteristic mineral in lithium-rich granitic pegmatites, serving both as a valuable mineral resource and an important gem material. This study incorporates three different color varieties of spodumene—pink to violet, yellow-green, and ...
Zijia Zhou +4 more
doaj +1 more source
Physico-chemical study of an exogenic fulgurite from a thunderstorm on 10th August 2013 in Dallas, TX [PDF]
, 2021 Droplet-like exogenic fulgurites comprise a minor grouplet of natural glasses resulting from powerful lightning strikes. Reports on such type-V fulgurites are scarce in the literature.
Alte da Veiga, Nuno M.S. +4 more
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Visible and Near‐Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review
Journal of Spectroscopy, Volume 2018, Issue 1, 2018., 2018 Clay minerals are the most reactive and important inorganic components in soils, but soil mineralogy classifies as a minor topic in soil sciences. Revisiting soil mineralogy has been gradually required. Clay minerals in soils are more complex and less well crystallized than those in sedimentary rocks, and thus, they display more complicated X‐ray ...
Qian Fang +6 more
wiley +1 more source
Color Dependence on Thickness in Topaz Crystal from Brazil
Advances in Condensed Matter Physics, Volume 2012, Issue 1, 2012., 2012 It is well known that crystals of topaz from the Eastern Brazilian Pegmatite Province may turn blue by the irradiation with 60Co gamma rays followed by heat treatment. Also, it is known that the sensation of color changes with the thickness of these crystals. The dependence of the color, given by 1931 CIE chromaticity coordinates, with the thickness of
Waldemar Bonventi Jr +3 more
wiley +1 more source
The Chemical Composition of Trapiche-like Quartz from Huanggangliang Area, Inner Mongolia, China
Crystals, 2022 Trapiche-like quartz, which is found in Huanggangliang area, Chifeng City, Inner Mongolia, China, has a short columnar euhedral shape. Arms of trapiche-like phenomena are formed by six radial dark bands located along the a-axis of crystals, and their ...
Ling Jiang, Zhu Chen, Yingxin Liu
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, 2018 Precious coral, with attractive pink-to-red color, has been used for ornamental purposes for several thousand years. According to the related science, attractive red precious corals material, are defined to the class Anthozoa, subclass Octocorallia ...
Fan, Luwei
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