Figure F80. Pyrite crystals (white) in the center, nucleated around quartz, and overgrown by marcasite crystals (light gray) that, in turn, are overgrown by more pyrite (Sample 193-1189A-2R-1 [Piece 15, 113-115 cm]; in reflected light; width of view = 0.28 mm. Photomicrograph ID# 1189A

Figure F80. Pyrite crystals (white) in the center, nucleated around quartz, and overgrown by marcasite crystals (light gray) that, in turn, are overgrown by more pyrite (Sample 193-1189A-2R-1 [Piece 15, 113-115 cm]; in reflected light; width of view = 0.28 mm. Photomicrograph ID# 1189A_70; thin section 33).