AM_Osumilite_6
Formula: K.74 Fe1.3 Mg.88 Si10.44 Al4.38 O30
Name: Osumilite
Unit cell: 10.145 10.145 14.289 90.0 90.0 120.0 , V=1273.61
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: Japan-Shimizu