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(crystal lattice with voids that can trap molecules)

A Clathrate is a chemical structure that can trap molecules by surrounding them, typically a crystal with "open holes" where a molecule might sit. They can occur in nature (e.g., formed at extreme pressures and/or Temperatures) and may be created artificially.

Clathrate Hydrates are water crystals in a pattern that are clathrates, and a Methane Clathrate (or Filled Ice) is a clathrate hydrate that is trapping Methane.