Figure F29. Photomicrographs showing kernels of olivine and brucite. A. Locally, olivine is preserved within the kernels of the serpentine mesh texture. Along its margins it is replaced by a mineral assemblage consisting of brucite (b), serpentine (s), and magnetite (arrow) (Sample 209-1274A-17R-1, 39–42 cm) (cross-polarized light: blue filter + condenser lens; field of view = 0.7 mm; image 1274A_017). B. Locally, relict olivine kernels are surrounded by serpentine (s) and brucite (b), forming a mesh texture (Sample 209-1274A-11R-1, 7–12 cm) (plane-polarized light; field of view = 0.7 mm; image 1274A_059). C. Brucite (b) (anomalous brown interference colors) in dunite is readily recognizable, forming kernels within the serpentine mesh texture (Sample 209-1274A-17R-1, 39–42 cm) (cross-polarized light: blue filter; field of view = 1.4 mm; image 1274A

Figure F29. Photomicrographs showing kernels of olivine and brucite. A. Locally, olivine is preserved within the kernels of the serpentine mesh texture. Along its margins it is replaced by a mineral assemblage consisting of brucite (b), serpentine (s), and magnetite (arrow) (Sample 209-1274A-17R-1, 39–42 cm) (cross-polarized light: blue filter + condenser lens; field of view = 0.7 mm; image 1274A_017). B. Locally, relict olivine kernels are surrounded by serpentine (s) and brucite (b), forming a mesh texture (Sample 209-1274A-11R-1, 7–12 cm) (plane-polarized light; field of view = 0.7 mm; image 1274A_059). C. Brucite (b) (anomalous brown interference colors) in dunite is readily recognizable, forming kernels within the serpentine mesh texture (Sample 209-1274A-17R-1, 39–42 cm) (cross-polarized light: blue filter; field of view = 1.4 mm; image 1274A_018).