Citation: Ben Smail, Ridha; Jouini, Tahar (2004). Na~4~Ni~5~[(As~1{-~x}P~x~)O~4~]~2~[(As~2y~P~2{-~2y})O~7~]~2~ (x = 0.27 and y = 0.295). Acta Crystallographica Section E, 60, pp. i1-i2.
Formula: As2.64 Na4 Ni5 O22 P3.36
Chemical name:tetrasodium pentanickel arsenic-phosphorus (2.67/3.35) twentytwooxide