Results 91 to 100 of about 941 (201)

Instrument and method for X-ray diffraction, fluorescence, and crystal texture analysis without sample preparation [PDF]

, 2010
An X-ray diffraction and X-ray fluorescence instrument for analyzing samples having no sample preparation includes a X-ray source configured to output a collimated X-ray beam comprising a continuum spectrum of X-rays to a predetermined coordinate and a ...
Arzoumanian, Zaven, Gendreau, Keith, Martins, Jose Vanderlei   +2 more
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Trapiche Garnets in Chun’an, Zhejiang Province, China: New Constraints from Their Gemology, Geochemistry, and Geochronology

Crystals
The trapiche garnet, a gemstone of unparalleled beauty, boasts a rare structure comprising one core, six radiating arms, and a main body. The occurrence of garnet within the trapiche structure elevates it beyond the species, granting it significant ...
Yingzhao Wang, Siyi Zhao, Yi Zhao, Zisheng Wang   +3 more
doaj   +1 more source

Gemology and Chemical Aspects of Aquamarines from Quixeramobim, Brazil [PDF]

Since the end of the 20th century, it has become extremely common for countries with a significant exploration of gemstones to catalog and disclose the properties of their gems for various purposes.
de Araújo Paschoal, Carlos William, de Oliveira, Isaac Gomes, dos Santos, Lucilene, Falcão de Oliveira Neri, Tereza, Menezes Diniz Madruga, Marcelo, Rodrigues, Linara Ivina de Castro   +5 more
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Origin of Color and Spectral Characteristics of Nanhong Agate from Northeast Yunnan, China

Crystals
Nanhong agate has attracted public attention as the most distinctive gemstone in China. Owing to the limited data on Nanhong agates from a new production area in northeastern Yunnan, this paper presents the first data from gemological studies on these ...
Qiuyun Song, Liurunxuan Chen, Ruohan Zuo, Xianchao Chen, Sugang Sui, Wenzhou Pu, Xiaoqi Yang, Shitao Zhang, Wenlian Liu   +8 more
doaj   +1 more source

Gemology and Geochemistry of Staurolites from the Casa Nova Region, Brazil [PDF]

The properties of minerals used as gemstones could help or even reveal new aspects about the geological evolution of the region where a mineral was found.
De Sousa Silva, Larissa, dos Santos, Lucilene, Falcão de Oliveira Neri, Tereza, Gomes de Oliveira, Isaac, Leal Neto, Antonio, Pinto Bezerra, Isabelle, Ravielly dos Santos, Breno   +6 more
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O anel de noivado de diamante: O papel de um adorno na história da sociedade contemporânea [PDF]

The use of a diamond ring is currently considered a tradition in an engagement. Considering the set of values commensurate with this tradition, the present work seeks to identify the semiotics associated with diamonds in conjunction with engagement rings
Mior, Paulina Helena Zanluchi, Oliveira, Mariana Pohlmann de, Pizzato, Gabriela Zubaran, Ribeiro, Vinicius Gadis   +3 more
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Inverted Diamond-shaped Notched Substrate and Patch for High-frequency Interference on Ultra-wideband Antenna [PDF]

, 2017
Notches loaded on a patch antenna can affect significantly on ‎the antenna impedance matching. Therefore, notching technique is an efficient way to reduce ‎the electromagnetic interference with unwanted bands.
Abdulhasan, Raed Abdulkareem, Alias, Rozlan, Audah, Lukman, Mumin, Abdul Rashid Omar, Ramli, Khairun Nidzam   +4 more
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Gênese e qualidade gemológica da ametista de diferentes depósitos brasileiros [PDF]

, 2023
Studying the characteristics of amethyst is important to investigate possible correlations between the formation environment and color, as color accounts for about 50 to 60% of the gemological evaluation. The objectives of this study were the gemological
Costa, Flávia Compassi da, Depianti, Janaina Bastos, Ferreira, Paulo Dias, Magalhães, Marcus Vinicius Dutra de, Marques, Rodson de Abreu   +4 more
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Study on Petrological and Mineralogical Characteristics of the Ningxia Helan Stone by X-ray Fluorescence Spectrometry and X-ray Diffraction

Yankuang ceshi, 2018
The Ningxia Helan Stone is one of the well-known stones that are used for making inkslab in China. The development and application of Helan Stone is becoming more and more widespread, and therefore, it is necessary to carry out a systematic study.
MENG Chang-feng, XUE Jun-hui
doaj   +1 more source

Gemology of Emeralds from Tauá, Brazil [PDF]

In Brazilian territory many occurrences do not have their gemological and optical properties documented or made public. This research aimed to analyze the mineralogical and gemological aspects of emeralds from the city of Tauá (Brazil), utilizing ...
Czar dos Santos, Gabriel, de Araújo Paschoal, Carlos William, de Oliveira Cunha, Alina, de Oliveira Neri, Tereza Falcão, de Sousa Carneiro, Laryssa, dos Santos, Lucilene, Fernandes Alves, Conceição Regina, Gomes de Oliveira, Isaac, Groat, Lee Andrew   +8 more
core   +1 more source