Figure F12. Photomicrograph (plane-polarized light) of oxide quartz diorite illustrating the association of subhedral, likely primary amphibole (Amph) with apatite (Ap), quartz (Qtz), and zircon (Zrc) (Sample 335-1256D-235R-1, 23–25 cm [Piece 5]; Thin Section 3). Plag = plagioclase.
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