Results 111 to 120 of about 238 (148)

The potential of lithium in alkali feldspars, quartz, and muscovite as a geochemical indicator in the exploration for lithium-rich granitic pegmatites: A case study from the spodumene-rich Moblan pegmatite, Quebec, Canada

Journal of Geochemical Exploration, 2019
Abstract The Li concentration of alkali feldspars, quartz, and muscovite from the spodumene-rich Main Sill of the Moblan pegmatite in Quebec, Canada, was used to evaluate the potential of the most common minerals in granitic pegmatites as indicators for the presence of Li-aluminosilicate mineralization. In Moblan, alkali feldspar crystals incorporate
Don R Baker, Victoria Maneta
exaly   +3 more sources

Alkali metal and rare earth element evolution of rock-forming minerals from the Gatumba area pegmatites (Rwanda): Quantitative assessment of crystal-melt fractionation in the regional zonation of pegmatite groups

Geochimica Et Cosmochimica Acta, 2014
Abstract This study presents a general model for the evaluation of Rayleigh fractional crystallisation as the principal differentiation mechanism in the formation of regionally zoned common and rare-element pegmatites. The magmatic evolution of these systems from a granitic source is reconstructed by means of alkali element and rare earth element ...
Niels Hulsbosch, Philippe Muchez, Luc André   +2 more
exaly   +3 more sources

On the mineralogy and geochemistry of niobium and tantalum in some granite pegmatites and alkali granites of Africa

Bulletin De Mineralogie, 1981
On étudie la minéralisation niobium˗tantale associée aux pegmatites de granite et aux roches granitiques alcalines d'Afrique et on présente une sélection de 124 analyses chimiques de divers minéraux de niobium et de tantale rencontrés au cours de cette étude.
von Knorring, Oleg, Fadipe, Akinola
exaly   +4 more sources

Distribution of rare alkali metals in chamber pegmatites as criterion in prospecting for optical fluorite and piezoquartz

International Geology Review, 1965
The distribution of rubidium and cesium in microcline-perthite was studied in five topaz- and fluorite-bearing zoned pegmatites. Determinations of mineral paragenesis aided in the interpretation of the results of the rare alkali metal determinations. The study lead to the following conclusions: 1) The Rb content in zoned fluorite and topaz pegmatites ...
Ye.D. Kalita
exaly   +3 more sources

Mineralogy and Geochemistry of Alkali Beryl from the Rare Metal Bearing Pegmatites of Marlagalla-Allapatna, Mandya District, Karnataka

Journal of the Geological Society of India, 1999
Abstract White coloured alkali beryl from the pegmatites of Mariagalla-Allapatna in Mandya district, Karnataka contains distinctly higher alkali elements (Na, Li, Rb, Ca) and relatively low beryllium oxide (c. 11 % BeO) compared to normal beryl. Beryl occurs mostly between graphic intermediate zone and quartz core in the complexly zoned,
Chanchal Sarbajna, R. P. Sinha, P. Krishnamurthy, K. V. G. Krishna, R. Viswanathan, D. C. Banerjee   +5 more
exaly   +3 more sources

Alkali-F-Rich Albite Zones in Evolved NYF Pegmatites: The Product of Melt–melt Immiscibility

Canadian Mineralogist, 2018
Axel Müller, B J Williamson, Reimar Seltmann   +2 more
exaly   +5 more sources

Synthetic Alkali Aluminosilicate-Hydroxide Systems as an Analogue to Optimize Lithium Recovery from LCT Pegmatites

Minerals, Metals and Materials Series
Yves Thibault
exaly   +3 more sources

Minerals of the gadolinite-(Y)-hingganite-(Y) series in the alkali granite pegmatites of the Kola Peninsula

Geology of Ore Deposits, 2014
Minerals of the gadolinite-(Y)-hingganite-(Y) series pertaining to the gadolinite-datolite group have been found in the alkali granite pegmatites of the Kola Peninsula. Gadolinite-(Y) is distinguished by its unique natural crystalline state. The unit-cell parameters of this mineral have elevated values as compared with those of gadolinite-(Y) from ...
L. M. Lyalina, E. A. Selivanova, Ye. E. Savchenko, D. R. Zozulya, G. I. Kadyrova   +4 more
openaire   +2 more sources

Hydrated CO3-Bearing Analog of Manganoeudialyte from Alkali Pegmatites of the Konder Pluton, Khabarovsk Krai

Geology of Ore Deposits, 2018
The chemical composition, crystal structure, and infrared (IR) spectrum of a hydrated CO3-bearing analog of manganoeudialyte from alkali pegmatites of the Konder pluton (Khabarovsk krai) are studied. The chemical composition of the mineral corresponds to the formula N[Na6.94H2O5.13(Y,REE)0.58.
A. S. Osipov, A. A. Antonov, T. L. Panikorovskii, A. A. Zolotarev   +3 more
openaire   +2 more sources

Trace element distributions between the perthite phases of alkali feldspars from pegmatites

Mineralogical Magazine, 1982
AbstractThe distribution of various trace elements between the K-feldspar and albite phases of perthites from several pegmatites was determined by ion microprobe. Ranges in distribution coefficients (wt. % in K-feldspar/wt. % in albite) are: Li, 1.2–780; Mg, 0.2–1.1; P, 0.1–17; Ca, 0.02–1.6; Cs, 32–820; Ba, 24–284; Pb, 1.6–30; Fe, 0.3–0.7; Rb, 59–5505;
Roger A. Mason
openaire   +2 more sources