Figure F34. Sphalerite or magnetite (too small to identify in thin section) precipitated on early pyrite and overgrown by later pyrite (Section 193-1189A-12R-1 [Piece 16, 122-126 cm] in reflected light, oil immersion; width of view = 0.014 mm. Photomicrograph ID# 1189A

Figure F34. Sphalerite or magnetite (too small to identify in thin section) precipitated on early pyrite and overgrown by later pyrite (Section 193-1189A-12R-1 [Piece 16, 122-126 cm] in reflected light, oil immersion; width of view = 0.014 mm. Photomicrograph ID# 1189A_86, thin section 42).