Figure F145. Photomicrograph showing a 15-mm-wide vein in recrystallized microcrystalline basalt. Grain size increases from the border to the middle of the vein (Sample 206-1256C-11R-7, 9-12 cm; field of view = 10 mm; thin section 79). A. Plane polarized light. B. Cross polarized light with additional gypsum plate.

Figure F145. Photomicrograph showing a 15-mm-wide vein in recrystallized microcrystalline basalt. Grain size increases from the border to the middle of the vein (Sample 206-1256C-11R-7, 9-12 cm; field of view = 10 mm; thin section 79). A. Plane polarized light. B. Cross polarized light with additional gypsum plate.