view article
Figure 3
Polyhedral representation of (a) Ca10(PO4)6F2, in which there is no tilting of the tetrahedra, (b) Ca10(AsO4)6F2 and (c) Ca10(PO4)6(OH)2 − xOx/2 with x  =  1.56, where the tetrahedra directed along a, b and [110] rotate about axes as indicated by the arrows. Unlike the prototype (Fig. 1[link]), the trigonal prisms have twisted their triangular faces to create metaprisms, which are polyhedra midway between trigonal prisms and octahedra.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 63| Part 2| March 2007| Pages 251-256
doi:10.1107/S0108768106053316
Follow Acta Cryst. B
Sign up for e-alerts
E-alerts
Follow Acta Cryst. on Twitter
Twitter
Follow us on facebook
Facebook
Sign up for RSS feeds
RSS