AM_Osumilite_5
Formula: K.69 Fe.26 Mg1.98 Si10.2 Al4.56 O30
Name: Osumilite
Unit cell: 10.078 10.078 14.319 90.0 90.0 120.0 , V=1259.48
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: Eifel-Nickenich