neon compound
... that some meteorites contain an unusual isotope of neon due to it being trapped in buckyballs in an endohedral neon compound?
... that some meteorites contain an unusual isotope of neon due to it being trapped in <a href="./Buckminsterfullerene" id="mwCEQ" rel="mw:WikiLink" title="Buckminsterfullerene">buckyballs</a> in an <a href="./Endohedral_fullerene" id="mwCEU" rel="mw:WikiLink" title="Endohedral fullerene">endohedral</a> <b id="mwCEY"><a href="./Neon_compounds" id="mwCEc" rel="mw:WikiLink" title="Neon compounds">neon compound</a></b>?