Crystal chemistry and miscibility of chernovite-(Y), xenotime-(Y), gasparite-(Ce) and monazite-(Ce) from Mt. Cervandone

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Marco E. Ciriotti
Messaggi: 29459
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Crystal chemistry and miscibility of chernovite-(Y), xenotime-(Y), gasparite-(Ce) and monazite-(Ce) from Mt. Cervandone

Messaggio da Marco E. Ciriotti » mer 19 gen, 2022 17:56

Prossima pubblicazione.

Referenza:
▪ Pagliaro, F., Lotti, P., Guastoni, A., Rotiroti, N., Battiston, T., Gatta, G.D. (2022): Crystal chemistry and miscibility of chernovite-(Y), xenotime-(Y), gasparite-(Ce) and monazite-(Ce) from Mt. Cervandone (Western Alps, Italy). Mineralogical Magazine, 86, (in press).

Abstract:
The crystal chemistry and crystal structure of the (REE)-bearing phosphates, monazite-(Ce), Ce(PO4), and xenotime-(Y), Y(PO4), as well as arsenates, gasparite-(Ce), Ce(AsO4), and chernovite-(Y), Y(AsO4), from the hydrothermal quartz-bearing fissures, related to pegmatites overprinted by amphibolite facies, outcropping at Mt. Cervandone (Western Alps, Piedmont, Italy), have been investigated by means of electron microprobe analysis in wavelength dispersion mode and single-crystal X-ray diffraction. The chemical data reveal the occurrence of a full solid solution among the isostructural chernovite-(Y) and xenotime-(Y) with tetragonal symmetry, whereas a wide miscibility gap is observed for the isostructural gasparite-(Ce) and monazite-(Ce) of Mt. Cervandone, with monoclinic symmetry. A significant chemical heterogeneity has been observed for several investigated samples, especially related to the Th content, which is locally enriched in ThSiO4 grains. The analysis of the refined structural models points out a significant control played by the composition of the tetrahedrally-coordinated (As,P)-bearing sites on the bulk unit-cell volume and on the size and shape of the (REE)-coordination polyhedra.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 29459
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Crystal chemistry and miscibility of chernovite-(Y), xenotime-(Y), gasparite-(Ce) and monazite-(Ce) from Mt. Cervand

Messaggio da Marco E. Ciriotti » lun 25 apr, 2022 9:52

Pubblicazione effetuata.

Referenza:
▪ Pagliaro, F., Lotti, P., Guastoni, A., Rotiroti, N., Battiston, T., Gatta, G.D. (2022): Crystal chemistry and miscibility of chernovite-(Y), xenotime-(Y), gasparite-(Ce) and monazite-(Ce) from Mt. Cervandone (Western Alps, Italy). Mineralogical Magazine, 86, 150-167.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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