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Methane hydrates are not the only clathrates that can form in the deep ocean environment.
This creates cage structures called clathrates , which release gas on the tongue as the ice melts, producing a fizzy sensation in the mouth.
Technically they are clathrates (crystalline solids), similar to ice except that they are not of uniform molecular composition: part of their structure is provided by a ‘guest’ molecule.
However, it is unclear how much natural gas is tied up in clathrates .
Low-density clathrate structures have been observed and modeled at below-ambient pressures and temperatures.
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