AM_Kvanefjeldite Formula: Na4 (Ca.5 Mn.5) Si6 O16 H2 Name: Kvanefjeldite Unit cell: 10.213 15.878 9.058 90.0 90.0 90.0 , V=1468.86 Space group: PCAB (61)

Johnsen O , Leonardsen E S , Falth L , Annehed H , Neues Jahrbuch fur Mineralogie, Monatshefte , 1983 (1983) p.505-512, Crystal structure of kvanefjeldite: The introduction of [Si3O7OH], layers with eight-membered rings, Locality: Ilimaussaq alkaline intrusion, South Greenland