Plate P3. Magnification for light micrography is 2200x. Light micrography: PH = phase-contrast light, PL = plain transmitted light, XP = cross-polarized light, SEM = scanning electron micrography. 11, 14. Staurolithites angustus, Sample 173-1069A-12R-3, 27-29 cm, PH (11) and XP (14).