Phosphosilicates of tetravalent uranium

A new variety of P-coffinite of (U,Ca,Fe)[(Si,P,S)O 4 ] idealized formula where P and C are the mineral-forming elements equally to U and Si has been discovered. This allows one to enlarge the list of the known minerals of tetravalent uranium with a new mineral taxon of U 4+ phosphosilicates. The cr...

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Bibliographic Details
Published in:Doklady earth sciences 2014-06, Vol.456 (2), p.755-758
Main Authors: Doynikova, O. A., Sidorenko, G. A., Sivtsov, A. V.
Format: Article
Language:English
Subjects:
Analysis
Crystals
Earth and Environmental Science
Earth Sciences
Geochemistry
Minerals
Phosphates
Silicates
Structure
Uranium
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Summary:A new variety of P-coffinite of (U,Ca,Fe)[(Si,P,S)O 4 ] idealized formula where P and C are the mineral-forming elements equally to U and Si has been discovered. This allows one to enlarge the list of the known minerals of tetravalent uranium with a new mineral taxon of U 4+ phosphosilicates. The crystalline structure of phosphosilicates is difficult to solve because of the dispersity of μm-sized crystals; therefore, crystallochemical analysis of probable transformations of mineral structures in polyhedrons was carried out. The consideration of the structures from coffinite (U 4+ -silicate) to ningyoite (Ca-U 4+ -phosphate) resulted in the conclusion on the possible existence of a series of U 4+ minerals of mixed anionic and, hence, cationic composition, i.e., of phosphosilicates and silicophosphates of tetravalent uranium, with the indispensable presence of calcium in the crystalline structure.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X14060336