Figure F56. Narrow anhydrite-pyrite vein (1-2 mm, along fracture) with a typical 1- to 1.5-cm-wide cyclically banded alteration halo. The different shades of gray are caused by varying proportions of quartz and clay (interval 193-1188F-2Z-1, 80-91 cm; Unit 29).

Figure F56. Narrow anhydrite-pyrite vein (1-2 mm, along fracture) with a typical 1- to 1.5-cm-wide cyclically banded alteration halo. The different shades of gray are caused by varying proportions of quartz and clay (interval 193-1188F-2Z-1, 80-91 cm; Unit 29).