Figure F108. Diabase dikes and diabase in plane-polarized light. The textures are obviously different, regardless of the chilled margin. A. Diabase dike intruded in gabbro (Sample 305-U1309D-124R-2, 45–47 cm). B. Contact of diabase dike and gabbro (Sample 305-U1309D-125R-2, 104–106 cm). C. Medium-grained diabase showing ophitic texture (Sample 305-U1309D-155R-2, 38–40 cm) (field of view = 2 cm).
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