Figure F22. Plane-polarized (A) and cross-polarized (B) transmitted light photomicrographs of moderately quartz + Mg chlorite–altered volcanic basement showing remnant volcanic glass (isotropic material, top left) surrounded by quartz + Mg chlorite alteration (Sample 331-C0013E-7L-CC, 60–62 cm). Field of view = 450 µm.
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