Results 61 to 70 of about 949 (188)
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 +15 more
wiley +1 more source
, 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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Yankuang ceshi, 2023 BACKGROUND The emerald is loved by people because of its gorgeous color and is respected as one of the world's four major gems. Due to the high value of emeralds, a variety of synthesis and optimization methods have emerged.
ZHU Hongwei +8 more
doaj +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 +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
Геолого-геммологические критерии оценки качества жильного кварца [PDF]
, 2011 Представлены результаты исследований геммологических характеристик различных генетических типов жильного кварца Среднеприднепровского и Приазовского мегаблоков Украинского щита, перспективного как камнесамоцветное сырье.Представлено ...
Цоцко, Л. И. +2 more
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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 +5 more
wiley +1 more source
Влияние палеорельефа на формирование механических ореолов рассеивания хромитовой минерализации в Среднем Побужье [PDF]
, 2011 Приведены результаты исследования влияния форм палеорельефа хромитоносных ультрабазитов Побужья на формирование и распространение экзогенных хромитовых руд.
Перков, Е. С. +2 more
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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
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 +6 more
wiley +1 more source