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Figure F21. Photomicrograph of thin section in cross-polarized light illustrating the microcrystalline gabbro observed within Subunit 4A (Sample 205-1253A-8R-1, 24-27 cm; thin section 13). Mag = magnetite, Pl = plagioclase, Ilm = ilmenite, Cpx =
clinopyroxene.
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