Figure 8. Morphology of sulfide minerals: a - mineral aggregates of the Fe, Cu, Zn, and S composition from the top of an old structure (Sample 3982-M1-2/1); b - sphalerite crystals from a cavity in a finely dispersed matrix, a combination of sphalerite tetrahedrons and octahedrons, twin crystals (Sample 3982-M1-2/1); c - scaly crystals of a Fe, Zn, S composition (same sample); d - combination of scaly sphalerite crystals and Fe sphalerite octahedrons from crystalline ore in the central (near-channel) zone of a pipe (Sample 3982-M1-2/3); e - sphalerite crystals of different forms and sizes with different iron contents. The large octahedrons contain less iron than the fine-grained matrix from the bottom of the pipe central zone (Sample 3982-M1-2/5); f - intergrowth of sphalerite scales with Cu, Fe, and Cr in the fine-grained matrix (Sample 3982-M1-2/5); g - intergrowth of sphalerite scales with pyrite framboids (Sample 3982-M1-3); h - relations between large sphalerite octahedrons and fine-grained sphalerite of the matrix (Sample 3982-M1-3); i - chalcopyrite and sphalerite intergrowths (Sample 3982-M1-4a); k - pyrite nodules on the scaly sphalerite complicating the faces of large sphalerite crystals (Sample 3982-M1-4c); l - large sphalerite crystals in intergrowths with fine-grained sphalerite (Sample 3982-M1-3a); m - bacteriogenic iron hydroxide material fron the outer surfaces of sulfide pipes (Sample 3982-M1-4c).