Results 11 to 20 of about 163 (100)
Gemological and Spectral Characteristics of Gem-Quality Blue Gahnite from Nigeria
Journal of Spectroscopy, 2023 Gem-quality blue octahedral crystalline gahnite was produced in Nigeria. This paper investigated gemological and spectroscopic characteristics by basic gemological experiments, electron probes, infrared reflectance spectroscopy, laser Raman spectroscopy,
Yifang Chen +4 more
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Gemological characteristics of jewelry-ornamental septaria of the Ulyanovsk region
Известия высших учебных заведений: Геология и разведка, 2019 Septaria of the Ulyanovsk region are high-quality jewelry and ornamental material. Septaria are associated with lower Cretaceous sediments and are located in the coastal cliffs and the beach area of the Volga river.
D. A. Petrochenkov
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Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar
Crystals, 2021 This paper employs an X-ray powder crystal diffractometer (XRD), an X-ray fluorescence spectrometer (XRF), an ultraviolet-visible-near infrared spectrometer (UV-Vis-NIR), a Fourier infrared spectrometer (FTIR), and a laser Raman spectrometer to ...
Siming Chen +4 more
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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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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
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Relationship between the Coloration Mechanism and Gemological Properties of Purple Scapolite
Crystals, 2023 Purple scapolite is a precious gemstone. In this paper, we compared the crystal structure and spectral characteristics of purple scapolite before and after heat treatment with conventional gemological tests, EPMA, XRF, LA-ICP-MS, infrared spectroscopy ...
Yinghua Rao +3 more
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The Gemological Characteristics of Chinese Peridot
Gems & Gemology, 1986 Figzzre 1. Two of the rough peridot nodrlles froin Chino that were used in this study. The larger measures 20.6 x 13.7 x 10.1 m m and weighs 23.71 ct. Photo O Tino Hammid. found in San Carlos, Arizona, which also occurs in basalt (Koivula, 1981)) no well-formed single crystals of rough peridot have been found in the Chinese deposits.
C W Fryer
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Variation in Gemological Characteristics in Tsavorites with Different Tones from East Africa
Crystals, 2022 In this paper, the influencing factors of the color and the gemological changes of tsavorites with different tones from East Africa were studied. The gemological characteristics of 35 different green tones in tsavorites were collected based on the ...
Yuanmeng Ma, Ying Guo
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Mineralogical and Gemological Characteristics and Color Genesis of Zibai Jade
CrystalsZibai Jade is a recently identified hydrogrossular-dominant jade originating from Shaanxi Province, China. It constitutes a polymineralic aggregate composed predominantly of hydrogrossular, with minor proportions of vesuvianite, diopside, chlorite ...
Linhui Song +3 more
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Mineral composition and gemological characteristics of the petrified wood of the Ulyanovsk region
Известия высших учебных заведений: Геология и разведка, 2019 For the first time, the mineral composition and gemological characteristics of the petrified wood from the Ulyanovsk region, of jewelry and ornamental quality, have been studied.
D. A. Petrochenkov
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