Results 131 to 140 of about 355 (183)
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Physicochemical aspects of allanite flotation
Journal of Rare Earths, 2014Abstract This paper investigated the physicochemical properties of allanite, a RE-silicate, by measuring zeta potential in the absence and presence of three different flotation collectors (benzohydroxamic acid, sodium oleate and dodecylamine). This data was then verified by microflotation experiments and with bubble-particle attachment pictures.
Adam Jordens, KRISTIAN Waters
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Monazite–allanite phase relations in metapelites
Chemical Geology, 2010Abstract Calculations of the transition from allanite to monazite-bearing assemblages in typical pelitic bulk compositions have been made using thermodynamic data estimated from oxide sums and inferred from natural parageneses. Calculations in the CFASHPCe and MnNCKFMASHPCe systems place the allanite to monazite transition in the middle amphibolite ...
Frank SPEAR
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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
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Recrystallization of metamict allanite
Mineralogical Magazine, 2011AbstractAllanite is a common accessory mineral in igneous rocks. Allanite becomes metamict over geological time-scales as a result of the α-decay of radioactive elements in the crystal structure. This study focuses on the recrystallization of metamict allanite from Savvushka, Russia.
Beirau, T., Paulmann, C., Bismayer, U.
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Journal of Radioanalytical and Nuclear Chemistry Articles, 1990
Allanites from Telixtlahuaca (Oaxaca, Mexico) were analyzed using the PIXE technique. The concentrations of 12 elements, mainly rare earths, were determined.
M. Jimenez-Reyes +3 more
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Allanites from Telixtlahuaca (Oaxaca, Mexico) were analyzed using the PIXE technique. The concentrations of 12 elements, mainly rare earths, were determined.
M. Jimenez-Reyes +3 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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The Canadian Mineralogist, 2002
“Allanite” is a poorly defined collection of species belonging to the epidote group. In the past, “allanite” was defined as merely being lanthanon-bearing, but more recently, it is defined as being Ln-dominant at the A2 site. Species of the allanite subgroup include allanite-(Ce), allanite-(La), allanite-(Y), androsite-(La), dissakisite-(Ce ...
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“Allanite” is a poorly defined collection of species belonging to the epidote group. In the past, “allanite” was defined as merely being lanthanon-bearing, but more recently, it is defined as being Ln-dominant at the A2 site. Species of the allanite subgroup include allanite-(Ce), allanite-(La), allanite-(Y), androsite-(La), dissakisite-(Ce ...
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Geological Society of America Bulletin, 1917
Introduction Many observers, both in this country and abroad, have noted the alteration exteriorly of allanite to usually a reddish brown product whose general appearance on casual examination seemed to be closely similar. This alteration is frequently conspicuous in localities where allanite is found at or near the surface in lumps and masses, and is
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Introduction Many observers, both in this country and abroad, have noted the alteration exteriorly of allanite to usually a reddish brown product whose general appearance on casual examination seemed to be closely similar. This alteration is frequently conspicuous in localities where allanite is found at or near the surface in lumps and masses, and is
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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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Annealing of radiation damage in allanite and gadolinite
Physics and Chemistry of Minerals, 1993Samples of allanite and gadolinite with a range of alpha-recoil damage 0.1 to 3.0 dpa, were annealed in Ar and analysed by X-ray powder diffraction (XRD), high resolution transmission electron microscopy (HRTEM), infrared (IR) and differential thermal analysis (DTA).
J. Janeczek, R.K. Eby
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