Figure 7: Sulfide ore minerals in epithermal quartz stringers. (a) Homogeneous chalcopyrite (Cp) in comb-structured quartz (Qtz), crossed nicols. (b) Same asin (a) but in polarized reflected light. (c) Translucent Fe-poor homogeneous sphalerite (Sph) in quartz (Qtz) stringer traversing the metatuff, plane polarizedlight. (d) Euhedral pyrite(II) (Py) in stringer traversing the metatuff, plane polarized light. (e) Silica microfracture (Qtz) in the metatuff with some pyrite(Py) and finer chalcopyrite (Cp), polarized reflected light. (f) Crustified silica stringer (Qtz) with nearly banded batches of pyrite (Py), chalcopyrite (Cp) andsphalerite (Sph), polarized reflected light.