Figure F69. Color close-up photograph of Sample 183-1139A-64R-4 (Piece 3, 35-43 cm, dry surface). Slightly to moderately altered vesicular trachybasalt (Unit 8) with abundant veins and vesicles filled with calcite, siderite, and clay. Vesicles have colloform textures with light brown siderite linings and white calcite interiors. Subvertical and subhorizontal calcite veins form an orthogonal network and locally offset vesicles (e.g., 41 cm). Thin (<0.5 mm wide) calcite veins locally offset wider vertical calcite vein.