crystal structure of boron-rich metal borides
... that the crystal structure of boron-rich metal borides may contain extended atomic units shaped as "superpolyhedra" and "tubes" ?
... that the <b id="mwGO8"><a href="./Crystal_structure_of_boron-rich_metal_borides" id="mwGPA" rel="mw:WikiLink" title="Crystal structure of boron-rich metal borides">crystal structure of boron-rich metal borides</a></b> may contain extended <a href="./Atom" id="mwGPE" rel="mw:WikiLink" title="Atom">atomic</a> units shaped as <a href="./Polyhedron" id="mwGPI" rel="mw:WikiLink" title="Polyhedron">"superpolyhedra"</a> and "tubes" <i id="mwGPM">(pictured)</i>?