Crystal chemistry of uranyl phosphates and arsenates from the Lodève (France) and Katanga (DRC) uranium deposits

In the mineral kingdom approximately 230 species contain uranium as an essential structural constituant. Nowadays, the crystal structure of less than 35% of the natural U-bearing minerals are known, and a lot of data about their chemical composition, stability and parageneses are still missing. The main objective of this project is to perform a complete.. Lire la suite

géologie et minéralogie |

The Rocks of the Grand-Duchy of Luxembourg: Creation of a lithotheca and microscopic analysis of the facies.

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Abstract The first real petrographical collection of the Museum dates back to 1852, when geologists decided to realize a geological map for the country. Now, the existing rocks collection contains approximately 1500 samples, 350 are national samples. The idea of developing a concept called “scientific lithotheca of the rocks of Luxembourg” was born in 2008... Lire la suite

géologie et minéralogie, projets de recherche, sciences de la terre |

Mineralogy of Luxembourg: Inventory of the minerals species and their localities

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Abstract Only a few thinks are known about the mineralogy of Luxembourg. Very few scientific studies were published before 1996. However, the first studies bring many interesting surprises. In particular studies of the copper, lead and antimony mines of the “Oesling” have revealed extremely rare mineral species such as brandholzite, chalcostibnite or ullmannite. In the.. Lire la suite

géologie et minéralogie, projets de recherche, sciences de la terre |

Mineralogy and petrography of phosphate minerals from Brazilian pegmatites, with a special emphasis on their relations with silicates

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Abstract The family of phosphate minerals contains more than 500 mineral species, which generally occur in rare-element granitic pegmatites. The knowledge of the crystal structures of these minerals, of their stability, and of their petrographic relationships, constitutes a powerful tool to understand the pressure-temperature-oxygen fugacity conditions which prevailed in rare-elements granitic pegmatites, during the crystallisation.. Lire la suite

géologie et minéralogie, projets de recherche, sciences de la terre |

Sedimentological and sequential analyses of the Quartzite of Berlé

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Abstract The quartzite of Berlé is a narrow, discontinued band of quartzite (10 to 15m thick) located at the base of the emsian basin of Neufchâteau-Wiltz-Eifel. The purpose of this study is to identify the reasons for the lateral discontinuity of the quartzite (fault, sedimentary gap, transition to a lateral equivalent,…), to locate it in.. Lire la suite

géologie et minéralogie, projets de recherche, sciences de la terre |

Fluid circulation study during the formation of polymetal deposits in Luxembourg

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Abstract The microthermometric study of samples coming from the Cu, Pb, Zn and Sb deposits from Eisleck, from ponctual Pb and Ba mineralisations in Guttland, and from basement quartz veins, had as goal the determination of pressure, temperature and compostion of the metasomatic fluids. These fluids are at the origin of the deposits, and by.. Lire la suite

géologie et minéralogie, projets de recherche, sciences de la terre |