Results 81 to 90 of about 15,039,014 (169)

Study on Petrological and Mineralogical Characteristics of the Ningxia Helan Stone by X-ray Fluorescence Spectrometry and X-ray Diffraction

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
doaj   +1 more source

The Gemological and Mineral Characteristics of Variscite from Ma'anshan of Anhui Province

Yankuang ceshi, 2014
Currently green and translucent variscites have been discovered near the turquoise ore body in the Ma'anshan mine. Some variscites can achieve gem grade. The testing methods of Electron Probe Microanalysis (EPMA), X-ray Powder Diffraction (XRD) analysis,
ZHOU Yan, QI Li-jian, DAI Hui, ZHANG Qing, JIANG Xiao-ping   +4 more
doaj   +2 more sources

Inclusions, Chemical Composition, and Spectral Characteristics of Pinkish-Purple to Purple Spinels from Mogok, Myanmar

Crystals
With 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, Geng Li, Liqun Weng, Meilun Zhang, Fabian Dietmar Schmitz   +4 more
doaj   +1 more source

Disordered dolomite as an unusual biomineralization product found in the center of a natural Cassis pearl. [PDF]

PLoS One, 2023
Zhou C, Jin S, Sun Z, Homkrajae A, Myagkaya E, Nilpetploy N, Lawanwong K.   +6 more
europepmc   +1 more source

Gemological Characteristic Difference between Colorless CVD Synthetic Diamonds and Natural Diamonds. [PDF]

Materials (Basel), 2021
Lu Q, Gong H, Guo Q, Huang X, Cai J.
europepmc   +1 more source

Gemological and Chemical Characterization of Gem-Quality Titanite from Morocco

Crystals
Titanite 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, Zhuang Miao, Yi Zhao, Bo Xu, Jialu Gu, Pengyu Yuan   +5 more
doaj   +1 more source

Mineralogical Characteristics and Color Genesis of Vesuvianite Jade from Hanzhong, Shaanxi Province, China

Crystals
A new type of vesuvianite jade has recently been discovered in Hanzhong City, Shaanxi Province, China. However, a systematic investigation into its mineralogical characteristics and the origin of its color is currently lacking.
Ye Yuan, Miao Shi, Ru Jia, Xuren Huang, Yi Zhang   +4 more
doaj   +1 more source

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 Abstracts

, 1991

core   +3 more sources

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