Results 51 to 60 of about 949 (188)
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
core +1 more source
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
core +4 more sources
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
core +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
doaj +1 more source
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
Tectonics and crustal evolution [PDF]
, 2016 We thank the Natural Environment Research Council (grants NE/J021822/1 and NE/K008862/1) for funding.The continental crust is the archive of Earth's history.
Cawood, Peter A. +2 more
core +4 more sources
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
core +1 more source
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
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
doaj +1 more source