AM_Panunzite Formula: Na4.53 K11.47 Al16 Si16 O64 Name: Panunzite Unit cell: 20.496 20.496 8.549 90.0 90.0 120.0 , V=3110.17 Space group: P63 (173)

Merlino S , Franco E , Mattia C A , Pasero M , De Gennaro M , Neues Jahrbuch fur Mineralogie, Monatshefte , 1985 (1985) p.322-328, The crystal structure of panunzite (natural tetrakalsilite), Locality: Somma-Vesuvius area, Italy, Note: x(O7) and y(O11) adjusted to match reported bond lengths