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CONTRIBUTION TO THE KNOWLEDGE OF PORTUGUESE URANIUM MINERALS (in Portuguese)

Journal Article · · Publicacoes do Museu e Laboratorio Mineralogico e Geologico da Universidade de Coimbra e do Centro de Estudos Geologico, Memorias e Noticias
OSTI ID:4084778
A study was made of Portuguese uranium minerals and several conclusions were reached. The uraninite of Urgeirica, identified by x-ray diffraction, had a differential thermal curve different from those listed in the literature. The differential thermal diagram of the sabugalite of Cortes Cimeira (Bendada) differs from those obtained previously. This mineral is closely associated with phosphuranylite. At Urgeirica and Reboleiro an alpha -uranophane was identified. A DTA curve with exothermal peaks at 100 and 725 deg C and endothermal peaks at 125 and 183 deg C was obtained from the Urgeirica alpha-uranophane. The metatorbernite and torbernite minerals appear to be always closely associated in nature. The two structures can however exist apart. Differential thermal study showed that it is possible to distinguish the torbernite from the metatorbernite. Optically, thermally, and by x rays, a perfect identity was found among the eleven autunites examined. (auth)
NSA Number:
NSA-15-011349
OSTI ID:
4084778
Journal Information:
Publicacoes do Museu e Laboratorio Mineralogico e Geologico da Universidade de Coimbra e do Centro de Estudos Geologico, Memorias e Noticias, Journal Name: Publicacoes do Museu e Laboratorio Mineralogico e Geologico da Universidade de Coimbra e do Centro de Estudos Geologico, Memorias e Noticias Journal Issue: 48; ISSN 0373-6474
Country of Publication:
Portugal
Language:
Portuguese