Figure F22. A. Photograph of partially talc altered serpentinite with remnants of serpentine pseudomorphs after orthopyroxene (interval 209-1268A-23R-2, 15–28 cm). Arrows indicate approximate position of thin section photographs. B, C. Photomicrographs of sample shown in A (Sample 209-1268A-23R-2, 18–21 cm) (cross-polarized light: blue filter; field of view = 2.75 mm). (B) Pervasive talc alteration has completely erased the matrix texture of the serpentinized harzburgite. A bastite pseudomorph after orthopyroxene (left) is partly replaced by veinlets of massive talc (image 1268A_40). (C) Talc replaces orthopyroxene (to the left of prominent spinel crystal in center of image) and former serpentine-chrysotile veins (left). Talc has completely erased the mesh texture of the serpentinized harzburgite (image 1268A

Figure F22. A. Photograph of partially talc altered serpentinite with remnants of serpentine pseudomorphs after orthopyroxene (interval 209-1268A-23R-2, 15–28 cm). Arrows indicate approximate position of thin section photographs. B, C. Photomicrographs of sample shown in A (Sample 209-1268A-23R-2, 18–21 cm) (cross-polarized light: blue filter; field of view = 2.75 mm). (B) Pervasive talc alteration has completely erased the matrix texture of the serpentinized harzburgite. A bastite pseudomorph after orthopyroxene (left) is partly replaced by veinlets of massive talc (image 1268A_40). (C) Talc replaces orthopyroxene (to the left of prominent spinel crystal in center of image) and former serpentine-chrysotile veins (left). Talc has completely erased the mesh texture of the serpentinized harzburgite (image 1268A_39).