Results 71 to 80 of about 163 (100)
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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Yankuang ceshi, 2018 The Ningxia Helan Stone is one of the well-known stones that are used for making inkslab in China. The development and application of Helan Stone is becoming more and more widespread, and therefore, it is necessary to carry out a systematic study.
MENG Chang-feng, XUE Jun-hui
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RSC AdvancesNormally, various minerals exist in quartz as inclusions.
ShuXin Zhao +5 more
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Arabian Journal of Geosciences, 2018 There are chalcedony and amethyst formations in two fields in Aydincik-Yozgat (West of Aydincik District, Keslik area and Southwestern of Haciilyas). The gemstones in this region have been formed within the gaps and cracks of the brecciated rocks of the fault zone in altered andesites.
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Gemological characteristics and the quality of sapphire from Krong H’Nang - Dak Lak
Science and Technology Development Journal - Natural Sciences, 2018 Sapphires in Krong H'Nang area have been found mainly in deluvialor alluvial placers which related to Pliocene-lower Pleistocene basaltoid formations (βN2-Q1). Their main colors are dark green, yellow-green, yellow more rarely dark blue, yellow-blue-green.
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CrystalsWith the increasing market demand for spinels of various colors, purple spinel—long regarded as a symbol of nobility—has attracted growing attention. In this study, pinkish-purple to purple spinels from the Mogok region of Myanmar were systematically ...
Danyu Guo +4 more
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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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Gemological characteristics and origin of basalt-related sapphire in Dong Nai province
Science and Technology Development Journal - Natural SciencesBasalt – related sapphire in Thong Nhat District, Dong Nai Province, Vietnam, are found in alkaline basalts and their lateritic weathering layers. This study employs standard gemological methods and advanced analytical techniques such as XRD, EDX, Raman spectroscopy, and FTIR to characterize their gemological properties, crystal chemistry, and ...
Le Ngoc Nang +4 more
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MineralsAfrica hosts numerous emerald deposits, among which Sumbawanga, located at the junction of Tanzania, Zambia, Congo, and Malawi, stands out as one of the significant localities. This study presents a comprehensive analysis of the gemological, spectroscopic, and inclusion characteristics of Sumbawanga (Tanzania) emerald samples utilizing techniques such ...
Yi Guo, Xiao-Yan Yu, Chen-Xi Li
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GEMOLOGICAL CHARACTERISTICS OF THE VARIETIES OF JASPER OF THE UKRAINIAN SHIELD [PDF]
Scientific practical journal «Precious and Decorative Stones», 2018 openaire +1 more source