Figure F6. Backscattered image of sulfide vein assemblage at Sample 169-1035F-12R-1, 139-142 cm. Pyrrhotite (po) and sphalerite (sph) are contemporaneous. Pyrite (py) is an alteration product of pyrrhotite. Blanded anhydrite (anh) borders the sulfide vein. The host rock is siltstone with chlorite. cpy = chalcopyrite.