You must have javascript enabled to display the crystal structure and Brillouin zone
Syntheses and crystal structures of Rb2 B2 Se7, Tl2 B2 Se7, Cs3 B3 Se10, and Tl3 B3 Se10: new perseleno-selenoborates with polymeric anionic chains, Zeitschrift fuer Anorganische und Allgemeine Chemie 627, 419 (2001)