Results 71 to 80 of about 4,204 (176)

Tourmalines from the Koktokay No.3 pegmatite, Altai, NW China: Spectroscopic characterization and relationships with the pegmatite evolution [PDF]

, 2008
Mössbauer spectra (MS), infrared spectra (IR) in the OH stretching region, and reflectance spectra (RS) were obtained for natural tourmalines from the Koktokay No.3 pegmatite, the contact zone, and the altered country rock, Altai, NW China. Black Fe-rich
Zhang, A, Ji, J, Li, Y, Wang, R, Hu, H, Zhang, H, Lu, X   +6 more
core   +1 more source

Ambiguities in Assigning Single‐Crystal NMR Data to Individual Atoms in the Crystal Structure: A Case Study of Hambergite, Be2BO3OH, by 9Be and 11B NMR Spectroscopy, XRD Measurements and DFT Calculations

Magnetic Resonance in Chemistry, Volume 64, Issue 4, Page 400-415, April 2026.
The fundamental question of how to assign NMR resonances to specific atoms in the unit cell is addressed by using the 9Be and 11B spectra of the natural mineral hambergite as a model system. ABSTRACT The NMR interaction tensors of 9Be and 11B of hambergite, Be 2BO 3OH, were derived from single‐crystal NMR experiments.
Jennifer Steinadler, Georg Krach, Kristian Witthaut, Tobias Stürzer, Rupert Hochleitner, Wolfgang Schnick, Thomas Bräuniger   +6 more
wiley   +1 more source

Supervised Swin Transformer‐Based Predictive Lithological Mapping and Uncertainty Quantification Using Aeromagnetic and Gravity Data

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 2, April 2026.
Abstract Lithological mapping is essential for the exploration of critical minerals supporting energy transition and national defense. Although recent advancements have incorporated multi‐source data sets and leveraged machine learning and deep learning (DL) methods, lithological mapping continues to face significant challenges, such as data imbalance,
Liang Ding, Gilles Bellefleur, Olivier Boulanger, Phuong Vo   +3 more
wiley   +1 more source

Maine Pegmatite Mines and Prospects and Associated Minerals [PDF]

, 1957
Maine Pegmatite Mines and Prospects and Associated Minerals Minerals Resources Index No.1 - Maine Geological Survey Department of Development of Industry and Commerce, Augusta, Maine (March 1, 1957). Contents: Introduction / Acknowledgments / Explanatory
Maine Geological Survey
core   +1 more source

Pegmatites and alkali feldspar granites as sources of industrial K-feldspar: A study from Borucu, Aksaray, Central Türkiye

Bulletin of the Mineral Research and Exploration
The Borucu (Aksaray) region, within the Central Anatolian Crystalline Complex, comprises a variety of rocks, including granite, alkali feldspar granite (AFG), pegmatite, and aplite dikes.
Gökhan Demirela, Mustafa Haydar Terzi, Ahmet Fatih Oskay   +2 more
doaj   +1 more source

A New Concept for an Integrated Mapping of Rare‐Earth Elements using Laser–Induced Fluorescence and Reflectance Spectroscopy

Advanced Sensor Research, Volume 5, Issue 3, March 2026.
We introduce a new integrated line‐scan sensor system that combines hyperspectral and laser‐induced fluorescence imaging as a non‐invasive alternative characterization technique specifically suited for rare‐earth element (REE) mapping and identification. We investigate in detail the potential and limitations in comparison to state‐of‐the‐art approaches
Titus Abend, Margret Fuchs, Jan Beyer, Sandra Lorenz, Nadine Schüler, Kay Dornich, Johannes Heitmann, Richard Gloaguen   +7 more
wiley   +1 more source

A Geochemical Investigation of the Usakos Gem Tourmaline Pegmatite, Namibia [PDF]

, 2014
The Usakos pegmatite, Namibia, is a highly evolved, rare-element LCT-type pegmatite. The pegmatite is emplaced in metasedimentary rocks of the Kuiseb formation.
Grassi, Leah R
core   +1 more source

Big Creek pegmatite area, Carbon County, Wyoming [PDF]

, 1961
Big Creek pegmatite area, Carbon County ...
R.S. Houston (10070053)
core   +1 more source

Radioactive and Spectral Characteristics of the Qiongjiagang Pegmatite-Type Lithium Deposit in the Himalayas and Their Significance of Ore Prospecting

Yankuang ceshi
Lithium resources play a crucial role in the new energy industry, and their efficient exploration is directly related to the safety and stability of the new energy industrial chain.
Zelin ZHANG, Hua WU, Lanfang HE, Jianwei ZHOU, Xingwang CHEN, Xiangyun KONG, Yuzhong KONG, Linna CHEN, Kangcheng ZHU, Ruoming LI, Zhewei SUN   +10 more
doaj   +1 more source

Mineralogical Characteristics and TIMS U-Pb Dating of Tantalite-(Mn) from the Bieyesamas Rare Metal Deposit, Xinjiang

Yankuang ceshi, 2020
BACKGROUND Tantalum is a scarce resource in China. A new breakthrough in ore prospecting was obtained on the tantalum ore in the Bieyesamasi area, Xinjiang, including new occurrences as well as the exploration of pegmatite-type rare metal resources ...
HE Han-han, ARKIN Tulson, WANG Deng-hong, WANG Rui-jiang, CHEN Zhen-yu   +4 more
doaj   +1 more source