AM_Grenmarite Formula: Zr2.3 Mn1.3 Ti.46 Na3.56 Ca.38 Si4 O16 F2 Name: Grenmarite Unit cell: 5.608 7.139 18.575 90.0 102.6 90.0 , V=725.75 Space group: P12/C1 (13)

Bellezza M , Franzini M , Larsen A O , Merlino S , Perchiazzi N , European Journal of Mineralogy , 16 (2004) p.971-978, Grenmarite, a new member of the gotzenite-seidozerite-rosenbuschite, group from the Langesundsfjord district, Norway: definition and crystal structure, Locality: Langesundsfjord district, Norway