AM_Dumortierite_1 Formula: Si3 Al6.84 B O18 Name: Dumortierite Unit cell: 11.798 20.21 4.71 90.0 90.0 90.0 , V=1123.04 Space group: PMCN (62)

Alexander V D , Griffen D T , Martin T J , American Mineralogist , 71 (1986) p.786-794, Crystal chemistry of some Fe- and Ti-poor dumortierites, Sample: #7, BYU 12-5119, from Virgin Mtns., Nevada, USA, O5y and O11x have been editted