AM_BaSi4O9
Formula: Ba Si4 O9
Name: BaSi4O9
Unit cell: 11.2469 11.2469 4.4851 90.0 90.0 120.0 , V=491.32
Space group: P113 (1)

Hazen R M , Yang H , Finger L W , Fursenko B A , American Mineralogist , 84 (1999) p.987-989, Crystal chemistry of high-pressure BaSi4O9 in the trigonal (P3) barium, tetragermanate structure