K2O6PV
Korthuis, V. C.Hoffmann, R. D.Huang, JinfanSleight, A. W.
Chemistry of Materials (1993) 5, 206-209
a=6.863(2)Å b=13.479(5)Å c=7.505(1)Å
α=90° β=111.02(1)° γ=90°
Na2O6PV
a=6.1805(7)Å b=12.436(1)Å c=7.386(1)Å
α=90° β=107.00(1)° γ=90°