Optical photomicrographs of samples in transmitted light. (A) Sample consists of olivine (ol), orthopyroxene (opx), and clinopyroxene (cpx) with minor spinel (sp) and shows a protogranular texture. (B) Dark inclusions in opx (sample 381). Inclusions are common in opx and cpx and are aligned along a plane parallel to (010) or (001) (Nesse 2004). (C) Black inclusions are found as a trail in the olivine grain (marked with a red arrows; sample 379). (D) Spinel to magnetite transition (sample 379). (E) Unpolarized image of the Ol-rich layer and px-rich layer (px, pyroxene) cut by mylonite (sample 379). (F) Cross-polarized image of the same area as shown in Figure 2E (sample 379). Horizontal direction in the image is parallel to the lineation of wall rock, and vertical direction is normal to the foliation of wall rock. (G) Mylonite in contact with the ol-rich large-grained area (L) (sample 379), consisting of two layers: one with the medium-grained area (M) and the other with the small-grained area (S). (H) Garnet grains found in the small-grained area (sample 379). This picture was taken with a λ plate.