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Série Negra black quartzites - Tomar Cordoba Shear Zone, E Portugal: mineralogy and cathodoluminescence studies [PDF]
, 2003 Inverno, C. M. C. +5 more
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The Crystal Structure of Allanite, OH(Ca,Ce)_2 (Fe^III,Fe^II) Al_2O Si_2O_7SiO_4
The Crystal Structure of Allanite, OH(Ca,Ce)_2 (Fe^III,Fe^II) Al_2O Si_2O_7SiO_4openaire
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Site splitting at M3 in allanite-(Ce)
Mineralogical Magazine, 2022AbstractWe report the crystal structure of allanite-(Ce), with composition (Ca1.0REE0.9□0.1)Σ2.0(Al1.46Fe3+0.52Fe2+0.76Mg0.12Ti0.15)Σ3.01Si3O12(OH) from the Xinfeng rare earth element (REE)-bearing granite in Guangdong Province, China. It has the unit cell a = 8.9550(4) Å, b = 5.77875(16) Å, c = 10.2053(4) Å, β = 114.929(5)° and Z = 2 in space group ...
Can Shen +6 more
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THE HYDROTHERMAL RECRYSTALLIZATION OF METAMICT ALLANITE-(Ce)
The Canadian Mineralogist, 2010Samples of metamict allanite-(Ce) originating from granite pegmatites were recrystallized by heating in air and under hydrothermal conditions. Recrystallization in air resulted in partial recovery of the crystal structure at 650°C. Heating at higher temperatures resulted in decomposition of the allanite structure to a multiphase assemblage containing ...
Čobić, Andrea +3 more
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Geology of Ore Deposits, 2016
The morphology, optical properties, and composition of allanite-(Ce) and allanite-(Y) from raremetal tourmalinite of the Severnyi granitic pluton in the Chukchi Peninsula have been studied, as well as the composition and structure of host metasomatic rocks and the assemblage of rock-forming and accessory minerals.
V. I. Alekseev +2 more
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The morphology, optical properties, and composition of allanite-(Ce) and allanite-(Y) from raremetal tourmalinite of the Severnyi granitic pluton in the Chukchi Peninsula have been studied, as well as the composition and structure of host metasomatic rocks and the assemblage of rock-forming and accessory minerals.
V. I. Alekseev +2 more
openaire +1 more source
Hyperfine Interactions, 2020
Radiation-damaged allanite-(Ce) starts to recrystallize at an annealing temperature below 700 K. At the same temperature Fe2+ → Fe3+ oxidation, as well as dehydration occurs. Three radiation-damaged samples (S74 20414: 0.55 wt% ThO2, LB-1: 1.18 wt% ThO2, R1: 1.59 wt% ThO2) as well as one crystalline sample (RS221) were investigated using 57Fe Mossbauer
Claudia Eva Reissner +4 more
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Radiation-damaged allanite-(Ce) starts to recrystallize at an annealing temperature below 700 K. At the same temperature Fe2+ → Fe3+ oxidation, as well as dehydration occurs. Three radiation-damaged samples (S74 20414: 0.55 wt% ThO2, LB-1: 1.18 wt% ThO2, R1: 1.59 wt% ThO2) as well as one crystalline sample (RS221) were investigated using 57Fe Mossbauer
Claudia Eva Reissner +4 more
openaire +1 more source
Vanadian allanite-(La) and Vanadian allanite-(Ce) from the Hemlo gold deposit, Ontario, Canada
Mineralogical Magazine, 1991AbstractAllanite-(La) (containing up to 7.80 wt.% V2O3 and with La/ΣREE and La/Ce atomic ratios up to 0.54 and 1.45, respectively) and allanite-(Ce) (up to 8.46 wt.% V2O3) occur in close association with vanadian muscovite, barian tomichite and vanadian titanite in the main ore zone of the Hemlo gold deposit, Ontario, Canada.
Yuanming Pan, Michael E. Fleet
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Allanite-(Ce): a Typical Mineral of Metakimberlite from the Lake Kimozero Area, Karelia
Geology of Ore Deposits, 2017Paleoproterozoic kimberlite from the Kimozero area in Karelia is the oldest rock of this type in Russia. It is strongly tectonized, metamorphosed, and it finally transformed into metakimberlite of the prehnite-pumpellyite facies with widespread lanthanide minerals: allanite-(Ce), bastnaesite-(Ce), bastnaesite-(La), parisite-(Ce), and monazite-(Ce). The
E. V. Putintseva, E. M. Spiridonov
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Mineralogy and Petrology, 2020
Acid decomposition using concentrated H2SO4 at elevated temperature (>200 °C) is a common process to recover rare earth elements (REE) from refractory minerals where the reactions form REE sulfates, which are dissolved during a subsequent water leach. While the decomposition of REE orthophosphates and fluorocarbonates is well-documented, investigations
Yves Thibault, Joanne Gamage McEvoy
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Acid decomposition using concentrated H2SO4 at elevated temperature (>200 °C) is a common process to recover rare earth elements (REE) from refractory minerals where the reactions form REE sulfates, which are dissolved during a subsequent water leach. While the decomposition of REE orthophosphates and fluorocarbonates is well-documented, investigations
Yves Thibault, Joanne Gamage McEvoy
openaire +1 more source