Lorenzenite

Na₂O₉Si₂Ti₂

Sundberg, M. R.Lehtinen, M.Kivekas, R.

American Mineralogist (1987) 72, 173-177

a=8.7128Å   b=5.2327Å   c=14.487Å

α=90°   β=90°   γ=90°