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Figure 5
Structures of methane: (a) illustration of possible sites around the icosahedra, (b) 21-molecule rhombohedral methane, with F1, F2, F3, F4 sites occupied; (c) view of the icosahedron packing in the rhombohedral methane (space group: [R\bar 3]). Two C sublattices are marked by different colors in a 21-molecule cell (non-icosahedral, green; icosahedral, grey).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
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