Dumortierite, GRR 1966, Margarite Peak, Fallbrook, CA, R Housley sample 0.081 mm, E || long axis = deep pink 400.33, 0.2572 400.92, 0.2637 401.52, 0.2704 402.12, 0.2775 402.72, 0.2845 403.32, 0.2921 403.92, 0.3002 404.52, 0.3062 405.12, 0.3148 405.72, 0.3229 406.32, 0.3302 406.91, 0.3373 407.51, 0.3453 408.11, 0.3529 408.71, 0.3609 409.31, 0.3691 409.91, 0.3767 410.51, 0.3844 411.11, 0.3918 411.71, 0.3993 412.3, 0.4074 412.85, 0.4158 413.45, 0.4227 414.05, 0.4296 414.65, 0.4365 415.25, 0.4432 415.84, 0.4503 416.44, 0.4572 417.04, 0.4643 417.64, 0.4709 418.24, 0.4785 418.84, 0.4857 419.44, 0.4930 420.04, 0.4999 420.64, 0.5073 421.23, 0.5161 421.83, 0.5238 422.43, 0.5320 423.03, 0.5403 423.63, 0.5487 424.23, 0.5581 424.83, 0.5669 425.43, 0.5753 426.03, 0.5843 426.63, 0.5926 427.22, 0.6013 427.82, 0.6100 428.42, 0.6180 429.02, 0.6260 429.62, 0.6344 430.22, 0.6411 430.82, 0.6492 431.42, 0.6561 432.02, 0.6634 432.61, 0.6701 433.21, 0.6766 433.81, 0.6837 434.41, 0.6909 435.01, 0.6976 435.61, 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