Results 41 to 50 of about 1,753 (198)
Gemological Characteristics of Blue-Violet Cordierite
CrystalsCordierite is a violet-blue gem mineral primarily composed of magnesium aluminum silicate. This study employed three samples of Mg-cordierite and conducted tests on their gemological characteristics, spectroscopic features, and chemical composition using
Wenjie Yan +3 more
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Crystals, 2023 The geographic origin determination of ruby is increasingly important in the gem trade and geological research. Unlike metamorphic-related ruby, the rarer basalt-related ruby has gained significant attention, especially from Thailand, a major producer of
Enqi Li, Bo Xu
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Photochromism, UV-Vis, Vibrational and Fluorescence Spectroscopy of Differently Colored Hackmanite
Crystals, 2023 Because of the rich fluorescent color and unique photochromic properties, hackmanite has attracted many mineralogists. In this paper, the basic gemmological characteristics and photochromic and fluorescence mechanisms of four different colors of ...
Chuchu Song +4 more
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'School adopts an experiment': the photoluminescence in extra-virgin olive oil and in tonic water [PDF]
, 2011 We report a laboratory activity, carried out along with high- and secondary-school students, that can be done to increase the interest of the young in scientific studies. Groups of selected students 'adopted' experiments at physics research laboratories,
AGLIOLO GALLITTO, Aurelio +2 more
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Journal of Spectroscopy, Volume 2019, Issue 1, 2019., 2019 This paper presents a spectroscopic analysis and solubility study of rosin, copal, and Burmese amber samples to reveal the structural changes that occur during amber formation. The infrared spectra indicate that during the long geological process of amber formation, small resin molecules first crosslinked and slowly oxidized, eventually forming a ...
Feng Bai +3 more
wiley +1 more source
CrystalsThis study measured the infrared spectra of secondary minerals in the oxidation zones of three types of copper ores: dioptase, malachite, and azurite, and assigned the peak positions of OH stretching vibrations and the origins of OH combination ...
Shaokun Wu +5 more
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Crystals, 2023 The Chuncheon nephrite deposit in South Korea is one of the major nephrite deposits in the world, but its origin has been rarely studied. This study explores the mineralogical and geochemical characteristics of the Chuncheon nephrite using a polarizing ...
Nan Li, Feng Bai, Qi Peng, Mengsong Liu
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3D Imaging of Gems and Minerals by Multiphoton Microscopy
, 2018 Many optical approaches have been used to examine the composition and structure of gemstones, both recently and throughout history. The nonlinear optical behavior of different gemstones has not been investigated, and the higher order terms to the ...
Cromey, Benjamin +2 more
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Journal of Spectroscopy, Volume 2018, Issue 1, 2018., 2018 In order to better understand the effect of transition metal cations on color of tourmaline, X‐ray photoelectron spectroscopy was used to investigate the species, chemical state, site occupancy, and chemical environment of color‐induced metal cations in colorful tourmaline samples from Minas Gerais State, Brazil.
Ming Li +6 more
wiley +1 more source
Color Mechanism Analysis and Origin Comparison of Pink-Purple Sapphires from Vietnam and Madagascar
CrystalsExtensive research has already been conducted on sapphires, yet there remains a notable absence of methods available to identify the provenance of pink-purple sapphires, particularly those originating from Vietnam and Madagascar. This study examined pink-
Qiurong Guo +5 more
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