Citation: Grey, I. E.; Macrae, C. M.; Mumme, W. G.; Pring, A. (2010). Townendite, Na8ZrSi6O18, a new uranium-bearing lovozerite group mineral from the Ilimaussaq alkaline complex, Southern Greenland. American Mineralogist, 95, pp. 646-650.
Formula: Ca0.16 Fe0.12 Mn0.16 Na6.42 O18 Si6 Sn0.04 Ti0.01 U0.02 Y0.14 Zr0.67
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Ca6 Fe6 Mn6 Na6 O54 Si18 Sn3 Ti3 U3 Y6 Zr3 (Ca2 Fe2 Mn2 Na2 O18 Si6 Sn Ti U Y2 Zr)
Multiplicity: 1