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Wakefieldite-(Y) from Montaldo di Mondovì (Italy): new data and crystal structure

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Abstract

Wakefieldite-(Y) with approximate composition (Y0.40Nd0.15Ce0.15Ca0.15Th0.15)(V0.92As0.08)O4 is reported from an abandoned Fe- and Mn-ore mines located at Montaldo di Mondovì, Piedmont, Italy. The zircon-type crystal structure (space group I41/amd; a = 7.2591 Å, c = 6.4255 Å) has been refined (R = 0.017 for 175 independent reflections) using X-ray diffraction data collected on a crystal from this locality. Our data confirm the validity of the species that previously had been only roughly defined using an impure pulverulent sample from Wakefield Lake (Quebec, Canada). The substantial (30%) joint replacement of Ca2+ and Th4+ for Y3+ in the present wakefieldite-(Y) expands the cell volume of pure YVO4 and could anticipate the existence of minerals with zircon-type structure and (A 2+0.5 A′ 4+0.5 )T 5+O4 composition.

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Acknowledgments

X-ray diffraction data were collected at Centro Interdipartimentale di Ricerca per lo Sviluppo della Cristallografia Diffrattometrica (CRISDI, Università di Torino). We are indebted to Gianluca Armellino, who kindly provided us with the studied specimen, to two anonymous referees and to the associate editor Stefano Merlino for their appreciated comments.

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Authors and Affiliations

  1. Dipartimento di Scienze Mineralogiche e Petrologiche, Università di Torino, Via Valperga Caluso 35, 10125, Turin, Italy

    Marcella Cadoni & Giovanni Ferraris

  2. Associazione Micromineralogica Italiana, Via San Pietro 55, 10073, Devesi-Cirié, Turin, Italy

    Marco E. Ciriotti

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  1. Marcella Cadoni
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  2. Marco E. Ciriotti
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  3. Giovanni Ferraris
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Correspondence to Giovanni Ferraris.

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Cadoni, M., Ciriotti, M.E. & Ferraris, G. Wakefieldite-(Y) from Montaldo di Mondovì (Italy): new data and crystal structure. Rend. Fis. Acc. Lincei 22, 307–314 (2011). https://doi.org/10.1007/s12210-011-0134-4

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  • DOI: https://doi.org/10.1007/s12210-011-0134-4

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