Figure F10. A. Close-up photograph of partially talc-altered serpentinite (interval 209-1268A-23R-2, 1528 cm) with remnants of serpentine pseudomorphs after orthopyroxene. Arrows indicate approximate position of thin section photographs. B, C. Photomicrograph showing pervasive talc alteration (Sample 209-1268A-23R-2, 1821 cm) (cross polarized light: blue filter; field of view - 2.75 mm). (B) Talc alteration has completely overprinted the matrix texture of the serpentinized harzburgite. A bastite pseudomorph after orthopyroxene (left) is being replaced by veinlets of massive talc (image 1268A_040). (C) Talc replacing 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_039).
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