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.