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Minerals 2018, 8(9), 414; https://doi.org/10.3390/min8090414

Supergene Uranyl Mineralization of the Rabejac Deposit, Lodève, France

1
Laboratoire de Minéralogie, B18, Université de Liège, 4000 Liège, Belgium
2
Section Minéralogie, Musée d’Histoire Naturelle, Rue Münster 25, 2160 Luxembourg, Luxembourg
*
Author to whom correspondence should be addressed.
Received: 21 August 2018 / Revised: 8 September 2018 / Accepted: 11 September 2018 / Published: 18 September 2018
(This article belongs to the Special Issue Actinide Mineralogy and Crystallography)
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Abstract

The Rabejac uranium deposit that is located in the Lodève region, France, is the type locality for three uranyl minerals species (fontanite, seelite, and rabejacite). In addition, this deposit shows an extraordinary supergene uranyl mineralization characterized by the presence of many rare secondary uranyl species. In the present study, a mineralogical description as well as new chemical and crystallographic data are reported on (meta)zeunerite, (meta)nováčekite, (meta)uranospinite, heinrichite, nováčekite-I, arsenuranospathite, umohoite, calcurmolite, becquerelite, billietite, and liebigite. The chemical data indicate that the arsenate members of the autunite/meta-autunite group incorporate a significant amount of phosphorus. Moreover, the uranospinite samples usually exhibit high Mg content, thus moving toward the nováčekite end-member composition. The refined unit-cell parameters for all of the investigated mineral species are in agreement with the previous data reported in the literature. Finally, a model describing the alteration of the primary uraninite and the formation of secondary uranyl minerals is proposed in agreement with the observed mineral assemblages. View Full-Text
Keywords: uranyl minerals; autunite group; EMPA; single-crystal X-ray; crystal structure; mineral evolution uranyl minerals; autunite group; EMPA; single-crystal X-ray; crystal structure; mineral evolution
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Dal Bo, F.; Hatert, F.; Philippo, S. Supergene Uranyl Mineralization of the Rabejac Deposit, Lodève, France. Minerals 2018, 8, 414.

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