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D. Patchwork aggregate pseudomorph of hydrothermal biotite and quartz after a magmatic ferromagnesian mineral. The linear streaks in the quartz (pale yellow) are probably fluid inclusions. A rounded crystal of zircon can be seen in near the center of the right edge of the photograph. The field of view is about 4.5 x 6.7 mm. Crossed-polar light. DDH 345-468
