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First crystal-structure determination of natural lansfordite, MgCO3·5H2O

Published online by Cambridge University Press:  02 January 2018

Fabrizio Nestola ,
Anatoly V. Kasatkin ,
Sergey S. Potapov ,
Olga YA. Chervyatsova  and
Arianna Lanza
Fabrizio Nestola*
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy
Anatoly V. Kasatkin
Affiliation:
Fersman Mineralogical Museum of Russian Academy of Sciences, Leninsky Prospekt 18-2, Moscow, 119071 Russia
Sergey S. Potapov
Affiliation:
Institute of Mineralogy, Ural Branch of Russian Academy of Sciences, Miass, Chelyabinsk Oblast’, 456317 Russia
Olga YA. Chervyatsova
Affiliation:
State Nature Reserve «Shulgan-Tash», Zapovednaya 14, Irgyzly, Burzyansk District, Bashkortostan Republic, 453585 Russia
Arianna Lanza
Affiliation:
Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland
*
*E-mail: fabrizio.nestola@unipd.it
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Abstract

This study presents the first crystal-structure determination of natural MgCO3·5H2O, mineral lansfordite, in comparison with previous structural works performed on synthetic analogues. A new prototype single-crystal X-ray diffractometer allowed us to measure an extremely small crystal (i.e. 0.020 mm × 0.010 mm × 0.005 mm) and refine anisotropically all non-hydrogen atoms in the structure and provide a robust hydrogen-bond arrangement. Our new data confirm that natural lansfordite can be stable for several months at room temperature, in contrast with previous works, which reported that such a mineral could be stable only below 10°C.

Keywords

carbonatelansforditeX-ray diffractionstructurestability

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 5 , October 2017 , pp. 1063 - 1071
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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Structure factors

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