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Figure 1
Modules of the ice structures: left, ice Ic; right, ice Ih. Coordinates of the water molecule centres: 1 (−2a,0,0); 2 (−a,−b,−c); 3 (a,−b,−c); 4 (2a,0,−c); 5 (a,b,0); 6 (−a,b,−c); 7 (−a,−b,−4c); 8 (2a,0,−4c); 9 (−a,b,−4c); 10 (0,0,−5c); 11 (−2a,0,−5c); 12 (a,b,−5c); 13 (a,−b,−5c). a = (2)1/2/3; b = (2/3)1/2; c = 1/3. Length unit is equal to the distance between oxygen atoms of neighbouring water molecules.

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