Results 31 to 40 of about 354 (163)
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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Location characteristics of tremolite jade from Dahua, Guangxi
地质科技通报, 2021 The tremolite jade found in Dahua County, Guangxi Province, is a new type of tremolite jade that has only appeared in the past two years with a low degree of research. But the jade in this production area occupies a large share in the market.
Zuowei Yin, Wenwei Wang, Qingchao Zhou
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Gemological and Spectroscopic Characteristics of “Jedi” Spinel from Man Sin, Myanmar
Minerals (Basel, Switzerland), 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
exaly +2 more sources
Color Genesis and Compositional Characteristics of Color-Change Sapphire from Fuping, China
Crystals, 2022 The color-change sapphire occurs in sillimanite-biotite gneiss in Fuping County Hebei province, China, is one of most famous sapphire deposits in China.
Hui Wang +4 more
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Известия высших учебных заведений: Геология и разведка, 2018 Fossils of marine reptiles are a new jewelry and ornamental material and collected in the Ulyanovsk region from the Upper Jurassic deposits. They consist of (wt. %): calcite — 52, apatite — 24 and pyrite — 23, and also gypsum presents.
D. A. Petrochenkov
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Origin of Color and Spectral Characteristics of Nanhong Agate from Northeast Yunnan, China
CrystalsNanhong agate has attracted public attention as the most distinctive gemstone in China. Owing to the limited data on Nanhong agates from a new production area in northeastern Yunnan, this paper presents the first data from gemological studies on these ...
Qiuyun Song +8 more
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Известия высших учебных заведений: Геология и разведка, 2019 For the first time, data on the mineral composition and gemological characteristics of the jewelry-ornamental ammonites of the Republic of Adygea have been presented.
D. A. Petrochenkov
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CrystalsMaw-sit-sit jade resembles kosmochlor-jadeitite in appearance and is spatially associated with it in the Myanmar Jade Belt. However, the mineral composition, microstructure, and petrogenesis of this type of jade remain unclear.
Yu Zhang, Guanghai Shi, Jiabao Wen
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The Gemological and Mineral Characteristics of Variscite from Ma'anshan of Anhui Province
Yankuang ceshi, 2014 Currently green and translucent variscites have been discovered near the turquoise ore body in the Ma'anshan mine. Some variscites can achieve gem grade. The testing methods of Electron Probe Microanalysis (EPMA), X-ray Powder Diffraction (XRD) analysis,
ZHOU Yan +4 more
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CrystalsA new type of vesuvianite jade has recently been discovered in Hanzhong City, Shaanxi Province, China. However, a systematic investigation into its mineralogical characteristics and the origin of its color is currently lacking.
Ye Yuan +4 more
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