Results 91 to 100 of about 354 (163)
Геолого-геммологические критерии оценки качества жильного кварца [PDF]
, 2011 Представлены результаты исследований геммологических характеристик различных генетических типов жильного кварца Среднеприднепровского и Приазовского мегаблоков Украинского щита, перспективного как камнесамоцветное сырье.Представлено ...
Цоцко, Л. И.
core
, 2022 Aquamarine is a variety of beryl, which has a light blue to dark blue color, in addition to a bluish-green color, the origin of its colors is attributed to various causes still under study.
Rojas, Arol Josué
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Water characterization and structural attribution of different colored opals. [PDF]
RSC Adv, 2022 Li N, Guo Q, Wang Q, Liao L.
europepmc +1 more source
Gemological and Chemical Characterization of Gem-Quality Titanite from Morocco
CrystalsTitanite is a widespread accessory mineral in igneous, metamorphic, and hydrothermal rocks, but few comply with gem-grade requirements. Previous studies on Moroccan titanite focused on elementary composition and U-Pb dating.
Yu Yuan +5 more
doaj +1 more source
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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Colorimetry characteristics and color contribution of fluorescence in natural Cr-containing spinel. [PDF]
Sci Rep, 2023 Tang J, Guo Y, Zhang J.
europepmc +1 more source
GEMOLOGICAL CHARACTERISTICS OF THE VARIETIES OF JASPER OF THE UKRAINIAN SHIELD [PDF]
Scientific practical journal «Precious and Decorative Stones», 2018 openaire +1 more source
The Gemological Characteristics of Pipi Pearls Reportedly from Pinctada Maculata [PDF]
Gems & Gemology, 2019 Nanthaporn Nilpetploy +2 more
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Spectroscopy and chromaticity characterization of yellow to light-blue iron-containing beryl. [PDF]
Sci Rep, 2022 Shang Y, Guo Y, Tang J.
europepmc +1 more source