http://www.sciencedaily.com/re…/2014/12/141216123829.htm
Carnegie's Ivan Naumov and Russell Hemley discover hydrogen forms grapheme layers/clusters instead of metal under pressure.
This is an experimental validation of the Rydberg matter structure of hydrogen.
Instead of high pressures, quantum mechanics can produce this ring structure using a principle called Rydberg Blockade.
Potassium provides a quantum mechanical template that directs hydrogen to form in rings just like potassium does...or lithium.
See
Mesoscopic Rydberg-blockaded ensembles in the superatom regime and beyond