Results 71 to 80 of about 949 (188)
Definition of a genetic model for the dark-colored overgrowths in pegmatitic gem tourmaline crystals [PDF]
, 2023 Elba gem tourmalines are renowned for the delicate pastel colors and the perfection of their crystal shapes in small size. Characteristic for these tourmalines is the presence of color anomalies that occur as dark-colored terminations, frequently at the ...
ALTIERI, ALESSANDRA
core
Geostandards and Geoanalytical Research, Volume 48, Issue 3, Page 637-660, September 2024.Key Points New set of widely available reference materials, for in situ measurement of volatile elements (H2O, CO2, S, Cl, F) in silicate glass of basaltic composition. Characterised using ERDA, NRA, EA, FTIR and EPMA, and SIMS on four different ion probes. SIMS CO2 measurement results are significantly influenced by the H2O content of the glass.
Yves Moussallam +17 more
wiley +1 more source
Authenticity and provenance studies of copper-bearing andesines using Cu isotope ratios and element analysis by fs-LA-MC-ICPMS and ns-LA-ICPMS [PDF]
, 2018 Whereas colored andesine/labradorite had been thought unique to the North American continent, red andesine supposedly coming from the Democratic Republic of the Congo (DR Congo), Mongolia, and Tibet has been on the market for the last 10years.
Fontaine, Gisela +3 more
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Gemmological Characteristics of Gemstone Varieties Found in the Pegmatite of Haramosh Area, Gilgit-Baltistan [PDF]
, 2020 Haramosh valley is located in eastern side of Gilgitcity (Fig. 1). Geographically it is located between74°44' 17.37 " E and 35° 51 '8.97 " N. The area is asub range of Karakoram in the south-central region ofthe Rakaposhi–Haramosh mountains.
Alam, Muhammad +5 more
core +2 more sources
CrystalsYuanjiang County is one of the most important gem-producing areas in China. The authors of this study discovered and collected gem-quality andradite Garnsts in the epidote amphibolite from the periphery of the ruby deposit in Shaku Village, Yuanjiang ...
Liu-Run-Xuan Chen +6 more
doaj +1 more source
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
doaj +1 more source
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
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
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
Fingerprinting of ruby and sapphire gemstones through Fourier-transform infrared (FTIR) methodologies [PDF]
Gemstones have significant economic, cultural and artistic value. Advances in the treatment and production of synthetic gemstones create the need for more precise identification methods to distinguish natural stones from their synthetic 10 and treated ...
Bayés-García, Laura +4 more
core +1 more source