In structure I, the unit cell contains 136 water molecules which are arranged so that they form 16 pentagonal dodecahedra (small cavities) and 8 hexakaidecahedra (large cavities).
Source: wiktionary
Hexakaidecahedron
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Other possible cage structures which the water molecules may adopt are the tetra- and the hexakaidecahedron.
Source: wiktionary
Moreover, it is impossible to separate gas molecules completely because the structure of propane hydrate consists of hexakaidecahedrons and dodecahedrons.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.