View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by AIR Universita degli studi di Milano 1 Revision_1 2 A single-crystal neutron diffraction study of wardite, 3 NaAl3(PO4)2(OH)4·2H2O 4 5 G. Diego Gatta, Alessandro Guastoni, Oscar Fabelo and Maria Teresa Fernandez-Diaz 6 7 Running title: Neutron diffraction study of wardite 8 9 Abstract, Keywords 10 Introduction 11 Sample description and occurrence 12 Experimental methods 13 Results 14 Discussion and conclusions 15 Acknowledgements 16 References 17 Figures/Tables 18 19 20 Corresponding author: G. Diego GATTA 21 Dipartimento di Scienze della Terra, Università degli Studi di Milano 22 Via Botticelli 23, I-20133 Milano, Italy 23 Tel. +39 02 503 15607, Fax +39 02 503 15597, E-Mail:
[email protected] 24 25 26 27 Manuscript submitted to Physics and Chemistry of Minerals 1 28 A single-crystal neutron diffraction study of wardite, 29 NaAl3(PO4)2(OH)4·2H2O 30 1,2 3 4 4 31 G. Diego Gatta , Alessandro Guastoni , Oscar Fabelo and Maria Teresa Fernandez-Diaz 32 33 1Dipartimento di Scienze della Terra, Università degli Studi di Milano, 34 Via Botticelli 23, I-20133 Milano, Italy 35 2 CNR-Istituto di Cristallografia, Via Amendola 122/O, I-70126 Bari, Italy 36 3Dipartmento di Geoscienze, Università degli Studi di Padova, 37 Via G. Gradenigo 6, I-35131, Padova, Italy 38 4Institut Laue-Langevin, 71 Avenue des Martyrs, F-38000 Grenoble, France 39 40 41 Abstract 42 The crystal structure and crystal chemistry of wardite, ideally NaAl3(PO4)2(OH)4·2H2O, was 43 investigated by single-crystal neutron diffraction (data collected at 20 K) and electron microprobe 44 analysis in wavelength-dispersive mode.