AM_Osumilite_1 Formula: (K.71 Na.28 Ca.01) Mg.92 Fe1.28 Mn.16 Si10.2 Al4.44 O30.996 H9 Name: Osumilite Unit cell: 10.155 10.155 14.284 90.0 90.0 120.0 , V=1275.68 Space group: P6/MCC (192)

Brown G E , Gibbs G V , American Mineralogist , 54 (1969) p.101-116, Refinement of the crystal structure of osumilite