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Figure F69. Photomicrographic atlas of gabbro microstructures (Sample 335(312)-U1256D-223R-2W; Thin Section 1) (cross-polarized light). A. Magmatic texture in an altered olivine (Ol) gabbro. B. Elongated plagioclase crystal in clinopyroxene (Cpx) grain. C. Complex plagioclase (Pl)-plagioclase boundaries with straight, embayed, and interfingered morphologies. D, E. Deformation twins in plagioclase grains. F. Radial cracks in olivine around altered inclusions.

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