Benitoite Formula: Ba Ti Si3 O9 Name: Benitoite Unit cell: 6.6 6.6 9.74 90.0 90.0 120.0 , V=367.43 Space group: P-6C2 (188)
Zachariasen W H , Zeitschrift fur Kristallographie , 74 (1930) p.139-146, The crystal structure of benitoite, BaTiSi3O9, Locality: Dallas Gem Mine, San Benito, Ca