Orthoborate triangles connect the basal vertices of the tetrahedra, forming a three-dimensional network with voids occupied by rubidium ions.
Christopher D. DeSpain, Chunhua Hu, Robert W. Smith 2008, 'Dirubidium digallium oxide bis(orthoborate)', Acta Crystallographica Section Ehttp://scripts.iucr.org/cgi-bin/paper?S1600536808005783. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)