Figure F41. GSC altered rock (Unit 6) with a remnant perlitic texture with superimposed dark alteration halos composed of silica-anhydrite-dusty pyrite ± clay and late anhydrite-(silica-pyrite) stockwork veining. The large white patch near the center of the photographed piece is late bleaching surrounding a late irregular anhydrite-pyrite vein (interval 193-1188A-8R-1, 108-140 cm).

Figure F41. GSC altered rock (Unit 6) with a remnant perlitic texture with superimposed dark alteration halos composed of silica-anhydrite-dusty pyrite ± clay and late anhydrite-(silica-pyrite) stockwork veining. The large white patch near the center of the photographed piece is late bleaching surrounding a late irregular anhydrite-pyrite vein (interval 193-1188A-8R-1, 108-140 cm).