Neoteric wrote:
] ] hydrogen clathrate hydrate
]
] anyone know what the chemical symbol for this would be?

It doesn't have one that would be particularly meaningful.

Basically, clathrate describes a class of materials where a gas is disolved in water, and the water molecules in the mixture form a complex repeating latice structure that has cavities that look a lot like buckminsterfullerine (buckyballs). The gas sits in those cavities.

So what they're saying is under low temp and high pressure, they can force this mixture into a very specific ice that has property that it holds on to the hydrogen really well.