AM_Brannockite_1 Formula: K Sn2 Li3 Si12 O30 Name: Brannockite Unit cell: 10.002 10.002 14.263 90.0 90.0 120.0 , V=1235.71 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, Sample: small domain