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-- T-4518 <br />ti5 <br />Figure 40. Photomicrograph of acanthite (ac), galena (g), and tetrahedrite (tt) filling open <br />space in quartz (q); acanthite and tetrahedrite are not distinguishable because of similaz <br />color and reflectivity; sample RM-2-11. Reflected light, uncrossed polars; field of view is ' <br />0.2 mm by 0.3 mm <br />r' <br />f <br />~- <br />r <br />