Figure F122. Photomicrograph showing primary plagioclase partly replaced by secondary feldspar (albite or K-feldspar) and crosscut by celadonite veinlets in extensively altered basalt (Sample 206-1256D-57R-3, 0-1 cm). A. Field of view = 1.25 mm; plane polarized light. B. Field of view = 1.25 mm; cross polarized light.

Figure F122. Photomicrograph showing primary plagioclase partly replaced by secondary feldspar (albite or K-feldspar) and crosscut by celadonite veinlets in extensively altered basalt (Sample 206-1256D-57R-3, 0-1 cm). A. Field of view = 1.25 mm; plane polarized light. B. Field of view = 1.25 mm; cross polarized light.