Figure F37. Photomicrograph showing alteration of plagioclase largely restricted to minor replacement by feathery green amphibole along internal cracks (Sample 209-1275B-18R-2, 9–12 cm) (plane-polarized light: blue + light gray filters; field of view = 0.7 mm; image 1275B

Figure F37. Photomicrograph showing alteration of plagioclase largely restricted to minor replacement by feathery green amphibole along internal cracks (Sample 209-1275B-18R-2, 9–12 cm) (plane-polarized light: blue + light gray filters; field of view = 0.7 mm; image 1275B_016).