Results 1 to 10 of about 248 (94)

Microtextural, spectroscopic, and chemical characterization of amazonite from the Serra Branca Pegmatite, Northeastern Brazil

Brazilian Journal of Geology, 2022
The Serra Branca pegmatite in northeastern Brazil is unique because of its megacrysts of bluish-green amazonite currently exploited for ornamental purposes and as high-quality gemstones.
Glenda Lira Santos, Sandra de Brito Barreto, Igor Manoel Belo de Albuquerque e Souza, José Ferreira de Araújo Neto, Luis Sanchéz-Muñoz, Lauro Cézar Montefalco de Lira Santos   +5 more
doaj   +2 more sources

Amazonite in Pakistan: A Comprehensive Study with XRD, XPS, SEM, and PL Analyses

Cumhuriyet Science Journal, 2023
Although amazonite minerals from various locations have been studied before rather less attention has been paid to the amazonite mineral from Pakistan. The present work is presented an extensive structural characterization of natural amazonite aliquots ...
Eren Cihan Karsu Asal
doaj   +1 more source

Petrogenesis and tectonic significance of Late Permian-Middle Triassic granitoids in Guobaoshan, eastern section of the eastern Tianshan mountains: Constraints from geochronology and geochemistry

Dizhi lixue xuebao, 2022
The eastern Tianshan-Beishan area is one of the important metallogenic belts in China, but the Late Permian-Middle Triassic tectonic evolution still remains a controversial issue.
HE Xinyu, FANG Tonghui, BO Hetian, LIU Haipeng, ZHANG Zhongyi, XIAO Wenjin   +5 more
doaj   +1 more source

Analytical database of Martian minerals (ADaMM): Project synopsis and Raman data overview

Journal of Raman Spectroscopy, Volume 53, Issue 3, Page 364-381, March 2022., 2022
The Analytical Database of Martian Minerals (ADaMM) provides the scientific community with a comprehensive set of spectroscopic and diffractometric data collected from a wide collection of mineral phases relevant for Mars exploration. As much of the given data have been collected by analytical prototypes emulating the spectroscopic tools onboard ...
Marco Veneranda, Aurelio Sanz‐Arranz, Jose Antonio Manrique, Jesus Saiz, Clara Garcia‐Prieto, Elena Pascual‐Sánchez, Jesus Medina, Menelaos Konstantinidis, Emmanuel Lalla, Andoni Moral, Luis Miguel Nieto, Fernando Rull, Guillermo Lopez‐Reyes   +12 more
wiley   +1 more source

Zircon Genesis and Geochronology for the Zhangbaoshan Super-Large Rubidium Deposit in the Eastern Tianshan, NW China: Implication to Magmatic-Hydrothermal Evolution and Mineralization Processes

Frontiers in Earth Science, 2021
The Zhangbaoshan (ZBS) super-large Rubidium deposit, located in the Eastern Tianshan, is a typical granite-type Rb deposit. The ZBS deposit is mainly hosted in the highly evolved Baishitouquan (BST) pluton enriched in F and Rb, which exhibits five ...
Jun Zhi, Ruxiong Lei, Boyang Chen, M. N. Muhtar, Zhijie Feng, Kai Zhang, Yuanfeng Cai, Changzhi Wu, Changzhi Wu   +8 more
doaj   +1 more source

Ultrastructure of a Columbite‐Tantalite Mineral from the Zhaojinggou Ta‐Nb Deposit in the North China Craton: Direct Evidence of the Formation Mechanism of the Columbite‐Group Minerals

Geofluids, Volume 2022, Issue 1, 2022., 2022
The formation of columbite‐group mineral phases in peraluminous granite has not been demonstrated to date. Here, a nanoscale study of the columbite‐tantalite mineral in the Zhaojinggou Nb‐Ta deposit in North China Craton elucidated its formation mechanism and the role of fluids in Nb‐Ta mineralization. Transmission electron microscopy (TEM) analysis of
Yushan Zuo, Zhengxi Gao, Lei Zuo, Peng Zhang, Rui Liu, Qing Zhang, Tingting Zhang, Fan Yang   +7 more
wiley   +1 more source

Whole-rock and mineral chemistry characterization of contrasting granitoids, constraints on the source of the Vieirópolis NYF-type pegmatites, Northeastern Brazil

Brazilian Journal of Geology, 2020
The Vieirópolis pegmatite field is characterized by amazonite pegmatites inserted in the Borborema Province. The Serra Branca pegmatite is hosted by the Serra Branca granites, which intruded partially the Serra Negra granites, and stands out by its ...
Igor Manoel Belo de Albuquerque e Souza, Ignez de Pinho Guimarães, Sandra de Brito Barreto, Glenda Lira Santos, José Ferreira de Araújo Neto   +4 more
doaj   +1 more source

Characterization and discrimination of some gem silicate minerals adopting LIBS, FTIR, and Raman spectroscopic techniques

AIP Advances, 2023
In this paper, characterization and discrimination of some silicate gems (gemstones and low-gem quality varieties) from ancient Egyptian mines have been performed for the first time adopting molecular and elemental spectroscopic techniques.
Amal Abdelfattah Khedr, Adel A. Surour, Ahmed El-Hussein, Mahmoud Abdelhamid   +3 more
doaj   +1 more source

Homogenization Experiments of Crystal‐Rich Inclusions in Spodumene from Jiajika Lithium Deposit, China, under Elevated External Pressures in a Hydrothermal Diamond‐Anvil Cell

Geofluids, Volume 2017, Issue 1, 2017., 2017
Extensive studies of the crystal‐rich inclusions (CIs) hosted in minerals in pegmatite have resulted in substantially different models for the formation mechanism of the pegmatite. In order to evaluate these previously proposed formation mechanisms, the total homogenization processes of CIs hosted in spodumene from the Jiajika pegmatite deposit in ...
Jiankang Li, I-Ming Chou, Daniel E. Harlov   +2 more
wiley   +1 more source

On Peculiarities of Propagation of a Plane Elastic Wave through a Gradient Anisotropic Layer

Advances in Acoustics and Vibration, Volume 2015, Issue 1, 2015., 2015
The problem of diffraction of a plane elastic wave by an anisotropic layer is studied. The diffraction problem is reduced to a boundary value problem for the layer. The grid method is used for solving the resulting boundary value problem. The diffraction of a plane longitudinal wave by the layer is considered.
Anastasiia Anufrieva, Dmitry Chickrin, Dmitrii Tumakov, Kim M. Liew   +3 more
wiley   +1 more source