Figure F129. Photomicrograph showing a vein composed of saponite and later silica minerals (early opal and later chalcedony) (Sample 206-1256D-22R-2, 111-113 cm). A. Field of view = 10 mm; cross polarized light. B. Detail showing vein composed of saponite and later silica minerals (early opal and later chalcedony) (field of view = 2.5 mm; plane polarized light). C. Detail showing vein composed of saponite and later silica minerals (early opal and later chalcedony) (field of view = 2.5 mm; cross polarized light).

Figure F129. Photomicrograph showing a vein composed of saponite and later silica minerals (early opal and later chalcedony) (Sample 206-1256D-22R-2, 111-113 cm). A. Field of view = 10 mm; cross polarized light. B. Detail showing vein composed of saponite and later silica minerals (early opal and later chalcedony) (field of view = 2.5 mm; plane polarized light). C. Detail showing vein composed of saponite and later silica minerals (early opal and later chalcedony) (field of view = 2.5 mm; cross polarized light).