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Deveroite-(Ce): a new REE-oxalate from Mount Cervandone, Devero Valley, Western-Central Alps, Italy

DOI: 10.1180/minmag.2013.077.7.11 DOI Help

Authors: A. Guastoni (University of Padova) , Fabrizio Nestola (University of Padova) , P. Gentile (Università di Milano-Bicocca) , F. Zorzi (Universita di Padova) , Matteo Alvaro (University of Padua) , A. Lanza (Universita di Padova) , L. Peruzzo (C.N.R., Istituto di Geoscienze e Georisorse) , M. Schiazza (Department of Earth Sciences, University G. d'Annunzio) , Nicola Casati (Swiss Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Mineralogical Magazine , VOL 77 (7) , PAGES 3019 - 3026

State: Published (Approved)
Published: October 2013

Abstract: Deveroite-(Ce), ideally Ce2(C2O4)3·10H2O, is a new mineral (IMA 2013-003) found in the alpine fissures of Mount Cervandone, overlooking the Devero Valley, Piedmont, Italy. It occurs as sprays of colourless elongated tabular, acicular prisms only on cervandonite-(Ce). It has a white streak, a vitreous lustre, is not fluorescent and has a hardness of 2–2.5 (Mohs' scale). The tenacity is brittle and the crystals have a perfect cleavage along {010}. The calculated density is 2.352 g/cm3. Deveroite-(Ce) is biaxial (−) with 2V of ~77°, is not pleochroic and the extinction angle (β ^ c) is ~27°. No twinning was observed. Electron microprobe analyses gave the following chemical formula: (Ce1.01Nd0.33La0.32Pr0.11Y0.11Sm0.01Pb0.04U0.03Th0.01Ca0.04)2.01(C2O4)2.99·9.99H2O. Although synchrotron radiation was not used to solve the structure of deveroite-(Ce) the extremely small size of the sample (13 μm × 3 μm × 1 μm) did not allow us to obtain reliable structural data. However, it was possible to determine the space group (monoclinic, P21/c) and the unit-cell parameters, which are: a = 11.240(8) Å, b = 9.635(11) Å, c = 10.339(12) Å, β = 114.41(10)°, V = 1019.6 Å3. The strongest lines in the powder diffraction pattern [d in Å(I)(hkl)] are: 10.266(100)(100); 4.816(35.26)(211İ); 3.415(27.83)(300); 5.125(24.70)(200); and 4.988(22.98)(111). Deveroite-(Ce) is named in recognition of Devero valley and Devero Natural Park.

Subject Areas: Environment, Materials

Instruments: I15-Extreme Conditions

Added On: 13/12/2013 17:53

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