Three new types of interpenetrating sphere packings

Three new types of homogeneous interpenetrating sphere packings are described. In the general position of space group Ccce, two sphere packings of type 3/10/o1 can be combined to form interpenetrating sphere packings of type o[3/10/o1](2). The other two types of interpenetrating sphere packings show symmetry Fddd: two packings of type 3/10/t4 are intertwined in o[3/10/t4](2) and three packings of type 3/4/t1 in o[3/4/t1](3). (C) 2009 International Union of Crystallography Printed in Singapore - all rights reserved