AM_Gedrite Formula: Si6.24 Al2.96 Mg4.48 Fe1.26 Ca.04 Na.36 O24 Name: Gedrite Unit cell: 18.531 17.741 5.249 90.0 90.0 90.0 , V=1725.65 Space group: PNMA (62)

Papike J J , Ross M , American Mineralogist , 55 (1970) p.1945-1972, Gedrites: Crystal structures and intracrystalline cation distributions, sample 001