Abstract
The holocrystalline ejecta mainly made up of sanidine occurring in the pyroclastic rocks of the Quaternary Roman Potassic Province of Latium, Italy, contain numerous rare minerals, among which two REE-bearing, probably new ones are preliminarly described. Mineral A is a trigonal borate of Al and REE, where Ce > La, and with a little substitution of Ca + Th for trivalent REE. Mineral B is a boroberilliosilicate of Ca, Fe and REE, where Y > Ce ≈ Nd, belonging to the gadolinite group, and of monoclinic symmetry.
Riassunto
I proietti olocristallini composti in prevalenza da sanidino che si rinvengono nelle piroclastiti della Provincia Potassica Romana contengono minerali rari, tra cui alcuni quasi certamente nuovi. Vengono qui descritti un borato trigonale di Al e terre rare, tra cui Ce prevale su La, parte delle quali sono sostituite da Ca + Th; e un boroberilliosilicato di Ca, Fe e terre rare, in cui Y prevale su Ce e Nd, appartenente al gruppo della gadolinite e perciò di simmetria monoclina.
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Nella seduta del 9 dicembre 1989.
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Ventura, G.D., Parodi, G.C., Mottana, A. et al. New rare earth minerals in the sanidinitic ejecta within pyroclastic rocks of the roman potassic province. Rend. Fis. Acc. Lincei 1, 159–163 (1990). https://doi.org/10.1007/BF03001890
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DOI: https://doi.org/10.1007/BF03001890