AM_Osumilite_9
Formula: K.69 Fe1.2 Mg.98 Si10.32 Al4.5 O30
Name: Osumilite
Unit cell: 10.137 10.137 14.308 90.0 90.0 120.0 , V=1273.29
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: Oregon