AM_Sugilite Formula: K (Fe1.66 Al.34) Li3 Si12 O30 Na1.96 Name: Sugilite Unit cell: 10.009 10.009 14.006 90.0 90.0 120.0 , V=1215.14 Space group: P6/MCC (192)

Armbruster T , Oberhansli R , American Mineralogist , 73 (1988) p.595-600, Crystal chemistry of double-ring silicates: Structures of sugilite and, brannockite, Note: x-coordinate of Na has been corrected