AM_Osumilite_2 Formula: K.91 (Fe.05 Mg1.98) Si10.32 Al4.65 O30 Name: Osumilite Unit cell: 10.086 10.086 14.325 90.0 90.0 120.0 , V=1262.01 Space group: P6/MCC (192)

Armbruster T , Oberhansli R , American Mineralogist , 73 (1988) p.585-594, Crystal chemistry of double-ring silicates: Structural, chemical, and optical, variation in osumilites, Sample: Antarctica