Results 71 to 80 of about 15,039,014 (169)
Identification of feldspar group isomorphic row using gemological methods. [PDF]
, 2009 SUMMARY KRISTIJONAS UNDZĖNAS IDENTIFICATION OF THE FELDSPAR GROUP ISOMORPHIC ROW MEMBERS USING GEMOLOGICAL METHODS The main objective of this dissertation is to assess the gemological methods affectivity and reliability for the identification of feldspar
Undzėnas, Kristijonas,
core
CrystalsThe Sar-e-Sang lapis lazuli deposit has a mining history exceeding 5000 years, producing the world’s finest lapis lazuli. Recently, gem-quality forsterite has been discovered in the marble containing spinel, dolomite, and phlogopite at the periphery of ...
Dai Zhang +11 more
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Study on the Microstructure and Spectra of Regrown Quartz Crystals from Chinese Jewelry Market
Crystals, 2021 Regrown quartz crystals consist of the natural section and the synthetic section grown by hydrothermal technique, which has become popular on the Chinese jewelry market in recent years.
Danyi Zhou +6 more
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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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Yankuang ceshi, 2016 Due to the nondestructive requirements of gem testing, evaluation of precious stones shows characteristics of science and uncertainty. Gemological application of X-ray Diffraction (XRD) is specialized, with its application mainly concentrated in three ...
ZHANG Ni, LIN Chun-ming
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, 2020 Basalt-related sapphire had been found in Pleistocene diluvial-diluvial deposits at Hong Liem, Ham Thuan Bac district, Binh Thuan province, Vietnam. The main color of the sapphire ranged from light to extremely dark bluish green to blue, and some are ...
Doan Thi Anh Vu
semanticscholar +1 more source
"Hopovo" gemstone occurrence (Fruška gora) [PDF]
Tehnika, 2020 This study presents geological, mineralogical, and gemological characteristics of gemstone deposit (silica and carbonate minerals) that occur in Mesozoic Fruška gora ultramafites in the vicinity of Hopovo Monastery.
Miladinović Zoran Ž.
doaj
CrystalsThe trapiche garnet, a gemstone of unparalleled beauty, boasts a rare structure comprising one core, six radiating arms, and a main body. The occurrence of garnet within the trapiche structure elevates it beyond the species, granting it significant ...
Yingzhao Wang +3 more
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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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The Gemological Characteristics of Pipi Pearls Reportedly from Pinctada Maculata
Gems & Gemology, 2019 “tiny” and is used to refer to the small, predominantly yellow or “golden” pearls that originate from the bivalve mollusk Pinctada maculata (Gould, 1846).
Nanthaporn Nilpetploy +2 more
semanticscholar +1 more source