Results 21 to 30 of about 15,039,014 (169)
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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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
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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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Gemmological, Spectroscopic, and Origin Description Studies of Tourmaline from Yunnan, China [PDF]
MoleculesThe Nujiang region of Yunnan is by far the richest tourmaline-producing mining area in China. Since the discovery of the tourmaline-bearing deposit in Yunnan Province in 1980, there have been few comprehensive gemmological studies of this deposit ...
Qishen Zhou +4 more
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Gemological and Luminescence Characteristics of Taaffeites from Mogok, Myanmar
Minerals (Basel, Switzerland), 2023 Taaffeite is a rare gem that has been found in different localities such as Tanzania, Sri Lanka, China, and Mogok, Myanmar. In this study, thirty-two taaffeite samples from Mogok, Myanmar, were investigated by conventional gemological testing, laser ...
Qian Zhang, Xiaojing Lai
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Crystals, 2022 Because of the increasing price of jadeite, many fake species have appeared on the market. We recognized three pieces of fake black jadeite that had been placed among real black jadeite.
Beiqi Zheng, Ke Li, Yuyang Zhang
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Gemological Characteristics and Trace Chemical Element Analysis of Emerald in Kafubu, Zambia
CrystalsThis study systematically analyzed the color characteristics, microscopic inclusions (including fluid and mineral inclusions), spectral properties, and chemical composition of emerald samples from Kafubu, Zambia using infrared spectroscopy, UV–visible ...
Yiwei Jiang +3 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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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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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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