From structure topology to chemical composition. XL Titanium silicates: crystal structures of innelite-1T and innelite-2M from the Inagli massif, Yakutia, Russia, and the crystal chemistry of innelite

摘要

The crystal structures of two polytypes of innelite, ideally Ba_4Ti_2Na_2M~(2+)Ti(Si_2O_7)_2[(SO_4) (PO_4)]O_2[O(OH)] where M~(2+) = Mn, Fe~(2+), Mg, Ca: innelite-1T, a 5.4234(9), b 7.131(1), c 14.785(3) A, a 98.442(4), (3 94.579(3), y 90.009(4)°, V 563.7(3) A~3, space group P1, D_(calc) = 4.028 g/cm~3, Z= 1; and innelite-2M, a 5.4206(8), b 7.125(1), c 29.314(4) A, ? 94.698(3)°, V 1128.3(2) A~3, space group P2/c, D_(calc). = 4.024 g/cm~3, Z = 1, from the Inagli massif, Yakutia, Russia, have been refined to R values of 8.99 and 7.60%, respectively.