melanophlogite
... that the crystal symmetry of melanophlogite changes depending on the guests trapped inside it?
... that the <a href="./Crystal_system" id="mwAio" rel="mw:WikiLink" title="Crystal system">crystal symmetry</a> of <b id="mwAis"><a href="./Melanophlogite" id="mwAiw" rel="mw:WikiLink" title="Melanophlogite">melanophlogite</a></b> changes depending on the <a href="./Clathrate_compound#Properties" id="mwAi0" rel="mw:WikiLink" title="Clathrate compound">guests</a> trapped inside it?