electronic reprint Acta Crystallographica Section B Structural Science ISSN 0108-7681 Editor: Carolyn P. Brock Crystal growth and twinned crystal structure of Sr 2 CaWO 6 G. Madariaga, A. Faik, T. Breczewski and J. M. Igartua Acta Cryst. (2010). B66, 109–116 Copyright c  International Union of Crystallography Author(s) of this paper may load this reprint on their own web site or institutional repository provided that this cover page is retained. Republication of this article or its storage in electronic databases other than as speciﬁed above is not permitted without prior permission in writing from the IUCr. For further information see http://journals.iucr.org/services/authorrights.html Acta Crystallographica Section B: Structural Science publishes papers in structural chem- istry and solid-state physics in which structure is the primary focus of the work reported. The central themes are the acquisition of structural knowledge from novel experimental observations or from existing data, the correlation of structural knowledge with physico- chemical and other properties, and the application of this knowledge to solve problems in the structural domain. The journal covers metals and alloys, inorganics and minerals, metal-organics and purely organic compounds. Crystallography Journals Online is available from journals.iucr.org Acta Cryst. (2010). B66, 109–116 G. Madariaga et al. · Crystal growth and structure