— Fresh rock samples were crushed in steel jaw crushers and powdered to grain sizes <200 mesh in an agate mill. The fine-grained rock powders were subsequently synthetized into glass with lithium tetraborate as a flux. ... Allanite did not record age information from Triassic metamorphism in its protolith due to its lower stability than …

 — The most common species in the allanite group is allanite-(Ce), which was fi rst described by Thomson (1810). As is commonly observed in REE-rich minerals, however, other REE

 — The regolith-hosted rare earth element (REE) deposits in South China are important sources of the world's REE production. The alteration processes of primary REE-bearing minerals in granitic …

 — INTRODUCTION. Epidote-group minerals rich in rare earth elements (REE), in particular allanite, are. common accessory phases in igneous, metamorphic, metasomatic, and sedimentary rocks. Small ...

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 — Allanite is one of the main rare earth elements (REE)-rich accessory minerals in composite dykes from the granitoid pluton of Karkonosze. These dykes differ in composition from the bulk of the pluton by elevated rare earth elements (REE), Y, Zr, and alkali contents, suggesting contribution of an additional component. Allanite exhibits …

Allanite - Ca,(REE) 3+ Al 2 Fe 2+ [Si 2 O 7][SiO 4]O(OH) Allanite, also known as "orthite" in Europe, was named in 1810 by Thomas Thomson for Thomas Allan, Scottish banker and mineralogist, who first observed the mineral. The structure of allanite is similar to that of the other monoclinic members of the epidote group.

 — A newly characterized allanite-bearing ore holds promise as a domestic source of rare earth elements (REEs) and other critical minerals amidst dynamic supply …

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•Subsurface (core, 160 kg) and near-surface (surface, 15 kg) allanite-based ores from Halleck Creek, Wyoming were crushed to top size of 2-4 mm via laboratory jaw and roll crushers. •Bulk samplesriffled into 1 kg representative sample lots for testing. •Fine material (i.e., < 150 µm) separated via wet sieving before dry

 — Abstract This study employs a combination of texture and composition of allanite to investigate the chemical evolution of rare earth elements (REEs) in the hydrothermal veins within the Chhotanagpur Granite Gneiss Complex around Kalapathar area, Purulia district, West Bengal, India. Allanite occurs as pockets and lumps in the …

 — The University of Kentucky (UK) Department of Mining Engineering was tasked to collect, pulverize, and analytically characterize REE-containing allanite ores from primary deposits in Halleck Creek ...

Allanite refers to a group of minerals found as an accessory in a number of different rocks such as syenite, granite and gneiss. It may also be a component of granite pegmatite. It is often associated with epidote, biotite, zircon, monazite and a number of rare earth, uranium or thorium-bearing minerals. ASHLAND COUNTY: Allanite is noted as an accessory in …

 — Allanite occurs as a relative rare REE mineral in selected granitic rocks of the Moldanubian batholith. This batholith represents one of the largest plutonic bodies in the European Variscan belt. Allanite was found in the Schlieren biotite granites and diorites 1 of the oldest Weinsberg suite, in biotite granodiorites of the youngest Freistadt suite and in …

 — The allanite reference materials analysed here have consistent 208 Pb/ 232 Th, 206 Pb/ 238 U ages (except for those samples with 206 Pb excess) and Tera–Wasserburg semi total U–Pb concordia intercept ages. Although the uncertainties on the U–Pb ages are typically significantly greater than the Th–Pb ages, combining these …

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 — U-Th-Pb dating and Sm-Nd isotopes of magmatic allanite from the Huangjiagou NYF pegmatites (lesser Qinling orogenic belt, China) were precisely measured and compared with zircon U-Pb dating and Lu-Hf isotopes to demonstrate the suitability and robustness of the U-Th-Pb and Sm-Nd system in allanite as a note-taker of formation …

Allanite always occurs near porous zone of apatite, which suggests that allanite grains characteristically occurring in apatite–augite–magnetite ore formed by REEs leached from apatite by hydrothermal fluid in hydrothermal stages. From: Handbook on the Physics and Chemistry of Rare Earths, 2016.

 — Abstract. Allanite is commonly encountered as an accessory rare-earth silicate mineral in association with minerals such as garnet, biotite, and feldspar. It is …

 — A newly characterized allanite-bearing ore holds promise as a domestic source of rare earth elements (REEs) and other critical minerals amidst dynamic supply and demand imbalances.

Allanite, volumetrically the most important sink of light rare earth elements (LREEs) in this deposit, occurs as disseminated grains, pockets, veins, and stringers in biotite schist and chlorite schist. Metasomatic addition of LREEs in the rock was associated with Ca-K-Fe ± B metasomatism, as evident from the vein mineralogy. ...

 — Characterization of Domestic Allanite R ar e Ear th Or e. Daniel A. Dailey 1, Zachar y D. Bak er 1, SJ L y cans II 1, Rianna Q. Mueller 2, Megan Fister2, Rick Q. Honaker3. 1 Department of Chemical ...

Allanite refers to a group of minerals found as an accessory in a number of different rocks such as syenite, granite and gneiss. It may also be a component of granite pegmatite. It is often associated with epidote, …

 — The onset of thermally induced, heterogeneous structural reorganization of highly radiation-damaged allanite-(Ce) begins at temperatures below 700 K. Three strongly disordered allanite samples (S74 20414: ~ 0.55 wt% ThO2, 22.1 wt% REE oxides, and maximum radiation dose 3.5 × 1018 α-decay/g; LB-1: ~1.18 wt% ThO2, 19.4 wt% REE …

 — Allanite is a residual phase up to temperatures of at least 900 and 1000 °C for metabasalts and metasediments, respectively, at ≤10% partial melting. Allanite is therefore capable of ...

Allanite-(Nd) mineral data, information about Allanite-(Nd), its properties and worldwide locations.

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 — Rare earth element (REE)- and gold-bearing breccia pipes are a potentially significant economic target in the Pea Ridge iron ore mine, Washington County, Missouri.

•Subsurface (core, 160 kg) and near-surface (surface, 15 kg) allanite-based ores from Halleck Creek, Wyoming were crushed to top size of 2-4 mm via laboratory jaw and roll …

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