Results 61 to 70 of about 1,753 (198)

Modeling the polychromism of oxide minerals: The case of alexandrite and cordierite

Journal of Computational Chemistry, Volume 45, Issue 12, Page 834-842, May 5, 2024.
In this work, we tested the embedded cluster approach for the simulation of the polychromism of alexandrite and cordierite by TD‐DFT. The fitted point charge embedding allowed to reproduce both transition energies and anisotropy of absorption spectra at the origin of the polychromism of these minerals. The simulation was in qualitatively good agreement
Raphaël Rullan, Pauline Colinet, Quentin Desdion, Stephan N. Steinmann, Tangui Le Bahers   +4 more
wiley   +1 more source

The Many Facets of Matthew Dearing [PDF]

, 2012
Whether crafting custom jewelry, performing onstage or sharing the excitement of citizen science, Matthew Dearing ’00 explores life’s dynamic ...
Huttes, Celeste
core   +4 more sources

An overview of Principal Components Analysis approaches in Raman studies of cultural heritage materials

Journal of Raman Spectroscopy, Volume 55, Issue 2, Page 125-147, February 2024.
The present overview answers the need of evaluating the current state of the art concerning the application of principal components analysis (PCA) to Raman spectroscopy studies of cultural heritage materials. Painting materials, both colouring and binding ones, were considered, together with natural and synthetic glasses, biogenic and mineral ...
Alessia Coccato, Maria Cristina Caggiani
wiley   +1 more source

High-Magnesium Olivines (Fo 90–100): Determination of Fo Content by Raman Spectroscopy

Crystals
Olivine is a dominant constituent of the Earth’s upper mantle, and its forsterite content (Fo = 100 × Mg/(Mg + Fetotal) in molar basis) holds significant implications for indicating petrogenesis.
Tianqi Wang, Mingyue He, Bijie Peng, Jingxuan Wang, Mei Yang, Ning Wang   +5 more
doaj   +1 more source

Petrogenesis of Chatoyant Green Nephrite from Serpentinite-Related Deposits, Ospinsk, Russia: Insights from Mineralogy and Geochemistry

Crystals, 2023
Ospinsk is an area in Russia well-known for mining the highest quality green nephrite in the world. However, the chatoyant green nephrite found here has not been studied to date.
Weishi He, Feng Bai, Chen Zhao, Hongting Qu, Xuemei Li   +4 more
doaj   +1 more source

The challenge of the identification of a new mineral species: example "Pezzottaite" [PDF]

, 2004
In 2002, a new gem mineral of commercial importance was discovered. In accordance with the need for all new mineral discoveries to be scientifically characterized (see Nickel and Grice, 1998), the gemological community anxiously awaited the results ...
Armbruster, Thomas, Cooper, Mark A., Falster, Alexander U., Grobéty, Bernard, Günther, Detlef, Hawthorne, Frank C., Laurs, Brendan M., Peretti, Adolf, Rossman, George R., Simmons, William B.   +9 more
core  

More Well-Endowed Chairs [PDF]

, 1976
In the February 1976 issue of Word Ways, Philip Cohen presented a collection of aptly-endowed college chairs. We invite him to attend the spring convocation of Ourtown Vocational Junior College to learn of some truly remarkable affinities between the ...
Oberlander, Frank, Oberlander, Mary
core   +1 more source

Characterizing Malysheva Emeralds (Urals, Russia) by Microscopy, Spectroscopy, Trace Element Chemistry, and Machine Learning

Crystals
The Malysheva emerald mine (Urals, Russia) boasts a long history and extraordinary emerald output. However, recent studies indicate that Malysheva emeralds share highly similar inclusion varieties, UV-visible-near infrared (UV-Vis-NIR) spectra, and ...
Yu-Yu Zheng, Xiao-Yan Yu, Bo Xu, Yu-Jie Gao   +3 more
doaj   +1 more source

Estudo da suscetibilidade ao escurecimento por radiação gama de quartzo róseo-leitoso da província pegmatítica da Borborema [PDF]

, 2015
Este estudo considera as transformações induzidas pela radiação γ sobre os defeitos estruturais em quartzo róseo e leitoso da Província Pegmatítica da Borborema (Paraíba e Rio Grande do Norte, Brasil).
Brito Barreto, Sandra de, Gomes Gonzaga, R.S., Guzzo, P.L., Melgarejo i Draper, Joan-Carles, Ribas de Miranda, M.   +4 more
core  

On the Lapidary Style [PDF]

, 2017
“The lapidary style” suggests a manner of writing that runs close to working a material—carving lettering into rock, cutting a gem into fine facets. Poised between the properties of the stone and of the jewel, this term holds the tensions of stone’s ...
Riley, Denise
core   +1 more source