Figure F4. Photomicrographs showing plagioclase, glass, and quench clinopyroxene crystals in groundmass. Note the spinel phenocryst in the upper right corner (Sample 209-1269B-1R-1 [Piece 7, 44–46 cm]). A. Plane-polarized light: blue + gray filters; field of view = 0.7 mm; image 1269B_003. B. Cross-polarized light: blue filter; field of view = 0.7 mm; image 1269B

Figure F4. Photomicrographs showing plagioclase, glass, and quench clinopyroxene crystals in groundmass. Note the spinel phenocryst in the upper right corner (Sample 209-1269B-1R-1 [Piece 7, 44–46 cm]). A. Plane-polarized light: blue + gray filters; field of view = 0.7 mm; image 1269B_003. B. Cross-polarized light: blue filter; field of view = 0.7 mm; image 1269B_004.