Figure F30. Gas pipe structure in Sample 200-1224D-4R-1 (Piece 3, 11.5-21.5 cm). A. Close-up photograph of the archive half, showing vertical pipes. B. Low-magnification photomicrograph of the large pipe at left in A (plane-polarized light), showing a large calcite-filled segregation vesicle within the pipe. Note the meniscus-like curvature at the base of the segregated basalt at the top of the vesicle. C. Low-magnification photomicrograph of two pipes at the right in A (plane-polarized light) D. Higher-magnification image of the texture of the igneous material in A (plane-polarized light). Oxide minerals (black) are prominent and include blocky titanomagnetite and finer trellislike ilmenite.

Figure F30. Gas pipe structure in Sample 200-1224D-4R-1 (Piece 3, 11.5-21.5 cm). A. Close-up photograph of the archive half, showing vertical pipes. B. Low-magnification photomicrograph of the large pipe at left in A (plane-polarized light), showing a large calcite-filled segregation vesicle within the pipe. Note the meniscus-like curvature at the base of the segregated basalt at the top of the vesicle. C. Low-magnification photomicrograph of two pipes at the right in A (plane-polarized light) D. Higher-magnification image of the texture of the igneous material in A (plane-polarized light). Oxide minerals (black) are prominent and include blocky titanomagnetite and finer trellislike ilmenite.