Results 31 to 40 of about 941 (201)
Characterization of Blue Tourmaline from Madagascar for Exploring Its Color Origin
Advances in Condensed Matter Physics, Volume 2022, Issue 1, 2022., 2022 In the research, spectroscopic studies of tourmaline for color origin were performed by X‐ray diffraction, Fourier transform infrared spectroscopy, ultraviolet‐visible spectroscopy, and X‐ray photoelectron spectroscopy. The research work emphasized the analysis of transition metal atoms, including their valence state and coordination number, in order ...
Ming Li, Ram N. P. Choudhary
wiley +1 more source
Gemological and Mineralogical Studies of Greenish Blue Apatite in Madagascar
Crystals, 2022 Madagascar is known as the ‘Island of Gemstones’ because it is full of gemstone resources. Apatite from Madagascar is widely popular because of its greenish blue Paraiba-like color. This study analyzes apatite from Madagascar through standard gemological
Zhi-Yi Zhang +3 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, Volume 22, Issue 12, December 2021., 2021 Abstract Biominerals that accrete shell or skeleton are commonly used as windows to past geochemical environments. Using biominerals as paleoproxies depends on the assumption that biominerals faithfully and predictably record environmental parameters, yet little has been done from a mineralogical perspective to understand how various environmental ...
G. A. Farfan +3 more
wiley +1 more source
Crystals, 2023 Agate attracts the attention of gem mineralogists because of its variable colors. The color of agate is closely related to its naming and classification, so it is necessary to study the color and mineral origin of agate.
Sixue Zhang +6 more
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A Case Study on Distribution of Gemstone in Bela Ophiolite, District Khuzdar, Balochistan [PDF]
, 2022 Bela Ophiolite and suture zone host several types of gemstones in the underlain and overlain rocks such as garnet (demantoid and almandine), quartz, brucite, malachite, chrysocolla, azurite, calcite, natrolite, green chert, jasper, serpentine, agate ...
Ahmad, Jalil +5 more
core +3 more sources
Journal of Raman Spectroscopy, Volume 52, Issue 1, Page 71-77, January 2021., 2021 Abstract Raman spectroscopy is a convenient, efficient, and non‐destructive technique that could estimate the metamictization degree of zircon, particularly for gem‐class or historical samples. The full width at half maximum value of the ν3(SiO4) band around 1000 cm−1 can classify the structural state of zircon as crystallized (the full width at half ...
Shijia Gao, Gerhard Heide
wiley +1 more source
Gemological Characteristics of Lvwen Stone and Its Color Genesis
Minerals, 2022 “Lvwen stone” is a yellow-green carbonate jade gemstone. In this study, the gemological characteristics and color genesis of Lvwen stone were investigated using conventional gemological testing methods and analytical techniques, such as X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–VIS ...
Zhendong Liu +10 more
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Gemological and Spectroscopic Characteristics of “Jedi” Spinel from Man Sin, Myanmar
Minerals, 2022 The price of spinel has sharply risen in recent years, and its market acceptance is extending. Among the many sources of spinel, Man Sin in Myanmar is the most famous for its bright neon pinkish red to reddish pink color, named “Jedi” spinel commercially.
Longpei Zhao, Geng Li, Liqun Weng
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Emeralds from the Delbegetey deposit (Kazakhstan): mineralogical characteristics and fluid-inclusion study [PDF]
, 2006 The aim of this study is to provide the first detailed mineralogical and fluid-inc1usion description of emeralds from the Delbegetey deposit (Kazakhstan).
Calvo Pérez, Benjamín +3 more
core +2 more sources
Crystals, 2023 Green diopside is currently popular in the jewelry market due to its attractive color and excellent transparency. Gem-quality diopsides are mainly sourced from Pakistan, Italy, Russia, and other places.
Zixuan Wang +3 more
doaj +1 more source