Citation: Miguel A. Salvad\'o; Pilar Pertierra; Santiago Garc\'ia-Granda; Sergei A. Khainakov; Jos\'e R. Garc\'ia; Anatoly I. Bortun; Abraham Clearfield (2001). Novel Silicate Anion: Si8O2212-. Hydrothermal Synthesis and X-ray Powder Structure of Three New Niobium Silicates. Inorganic Chemistry, 40, pp. 4368-4373.