Results 61 to 70 of about 163 (100)
Mechanical Impact of Heterogeneously Distributed H2O on Quartz Deformation
Journal of Geophysical Research: Solid Earth, Volume 129, Issue 8, August 2024.Abstract In order to identify relations between mechanical behavior, deformation mechanisms, microstructural properties, and H2O distribution, Tana‐quartzite samples with added H2O ranging from 0 to 0.5 wt.% were deformed by axial shortening at constant displacement rates, at 900°C and 1 GPa, reaching up to ∼30% bulk strain.
Petar Pongrac +9 more
wiley +1 more source
Journal of Raman Spectroscopy, Volume 55, Issue 2, Page 200-215, February 2024.A collection of Hellenistic–Roman glyptics was investigated in situ at the Regional Archaeological Museum “Paolo Orsi” (Syracuse, Italy), with portable Raman spectroscopy. 85% of the samples was successfully identified, the attribution was corrected for 4% of the gemstones, among which a gold ring with garnet, previously mistaken for carnelian.
Maria Cristina Caggiani +5 more
wiley +1 more source
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
doaj +1 more source
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
doaj +1 more source
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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"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
Gemological Characteristics of Aquamarine from the Gilgit-Baltistan of Northern Areas, Pakistan
Journal of the mineralogical society of korea, 2015 We applied gemological analytical approaches on Aquamarine from the Gilgit-Baltistan of Northern Areas, Pakistan. The standard gemological testing indicates that they are consistent with general characteristics of natural aquamarines. We have identified the inclusions of Tantalite-Mn by Raman analysis.
Sung Jae Kim +3 more
openaire +1 more source
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
doaj +1 more source
Gemmological, Spectroscopic, and Origin Description Studies of Tourmaline from Yunnan, China
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
doaj +1 more source