Results 51 to 60 of about 163 (100)

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, Hanlie Hong, Lulu Zhao, Stephanie Kukolich, Ke Yin, Chaowen Wang, Jose S. Camara   +6 more
wiley   +1 more source

Agates from Sidi Rahal, in the Atlas Mountains of Morocco: Gemological Characteristics and Proposed Origin

Gems & Gemology, 2013
Marek Lankosz, Lucyna Natkaniec-Nowak
exaly   +3 more sources

Evaluation of the Color Changing of Flux‐Synthesized Beryl by Ni Doping Using CIE1976 Color Parameters

European Journal of Inorganic Chemistry, Volume 29, Issue 13, 1 May 2026.
Comprehensive quantitative analysis of the relationship between NiO concentration and CIE1976 color parameters in Ni‐beryl crystals. Rough beryl contains various transition metal species owing to its geological formation conditions, and their concentrations largely determine the resulting crystal's color—a key physical property that strongly influences
Yusei Sonobe, Takahiko Morisaki, Risa Utumi, Ryosuke Kumamoto, Kazumichi Yanagisawa, Shuji Oishi, Yoshinori Nishiwaki, Kazuya Imamura, Takuya Matsuzaki, Kenji Shimizu, Kazuya Kobiro, Akitaka Ito, Shotaro Hayashi, Keigo Yano, Kogen Horikawa, Daisuke Kozaki   +15 more
wiley   +1 more source

Spectroscopic Characteristics of Treated‐Color Natural Diamonds

Journal of Spectroscopy, Volume 2018, Issue 1, 2018., 2018
With the increasing availability of treated‐color diamonds on the market, their characterization is becoming more and more critical to the jewelry testers and customers. In this investigation, ten color diamonds treated by irradiation (4 pieces), HPHT (3 pieces), and multiprocess (3 pieces) were examined by spectroscopic methods.
Meili Wang, Guanghai Shi, Joe C. C. Yuan, Wen Han, Qing Bai, Vincenza Crupi   +5 more
wiley   +1 more source

The Pace di Siena and its Gems

Journal of Raman Spectroscopy, Volume 56, Issue 11, Page 1254-1278, November 2025.
For the first time, the gems of the Pace di Siena, a rare en ronde bosse enamel preserved in Arezzo (Italy), have been analyzed using a transdisciplinary approach. The combination of gemmology and Raman spectroscopy has led to the identification of blue sapphires and pink spinels, contradicting previous historical classifications.
Stefania Martiniello, Simi Maria Emilia Mangani, Stefano Legnaioli, Massimo Chiari, Vincenzo Palleschi, Aaron Palke, Simona Raneri   +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, Sadao Isotani, Antonio Roberto Pereira Albuquerque, Mohindar S. Seehra   +3 more
wiley   +1 more source

Jewelry and ornamental concretions with fossils of the Republic of Kabardino-Balkaria. Mineral composition, gemological characteristics

Известия высших учебных заведений: Геология и разведка, 2023
Background. Along with ammonites and septaries, concretions with fossils are increasingly being used as jewelry and ornamental materials in Russia. Such concretions are characterized by a wide range of sizes, as well as high decorative and technological ...
D. A. Petrochenkov, E. Yu. Baraboshkin
doaj   +1 more source

Material Profiling of Mesopotamian Cylinder Seals by Raman Spectroscopy

Journal of Raman Spectroscopy, Volume 56, Issue 3, Page 228-242, March 2025.
Mesopotamian cylinder seals (fourth ‐ first millennium bce) from the collection of Museum für Kunst und Gewerbe, Hamburg were non‐destructively studied by Raman spectroscopy were non‐destructively studied by Raman spectroscopy. The Raman spectral analysis identified the mineral constituents and quantitatively determined the chemical compositions of the
Stylianos Aspiotis, Albert Dietz, Zsombor Földi, Frank Hildebrandt, Jochen Schlüter, Boriana Mihailova   +5 more
wiley   +1 more source

A Machine Learning Approach to Single Garnet Geothermometry and Application to Tracing the Fingerprint of Superdeep Diamonds

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 3, March 2025.
Abstract Estimating the equilibration temperatures of mantle‐derived garnets is crucial for assessing the diamond potential of kimberlites. Traditional garnet geothermometers require co‐existing mineral data or costly trace element analysis, limiting their practical use.
Qiwei Zhang, Matthew F. Hardman, Thomas Stachel, Ingrid Chinn, Michael Seller, Bruce Kjarsgaard, D. Graham Pearson   +6 more
wiley   +1 more source

ND70 Series Basaltic Glass Reference Materials for Volatile Element (H2O, CO2, S, Cl, F) Measurement and the C Ionisation Efficiency Suppression Effect of Water in Silicate Glasses in SIMS

Geostandards and Geoanalytical Research, Volume 48, Issue 3, Page 637-660, September 2024.
Key Points New set of widely available reference materials, for in situ measurement of volatile elements (H2O, CO2, S, Cl, F) in silicate glass of basaltic composition. Characterised using ERDA, NRA, EA, FTIR and EPMA, and SIMS on four different ion probes. SIMS CO2 measurement results are significantly influenced by the H2O content of the glass.
Yves Moussallam, William Henry Towbin, Terry Plank, Hélène Bureau, Hicham Khodja, Yunbin Guan, Chi Ma, Michael B. Baker, Edward M. Stolper, Fabian U. Naab, Brian D. Monteleone, Glenn A. Gaetani, Kenji Shimizu, Takayuki Ushikubo, Hyun Joo Lee, Shuo Ding, Sarah Shi, Estelle F. Rose‐Koga   +17 more
wiley   +1 more source