Black opal starts as a couple of low angle flaring cracks, that moves up to a steep bulge with three vertical slashes in it (crux) to lower angle climbing up higher. It is left of Blue Wind, and right of Hemrhoids in Flight.
Part of the group of 4 climbs at the far right end of Lower Buttress. Identify it by the three vertical slashes on the bulge.
standard rack. Offset gear, particularly hb offset nuts, are VERY helpful, as the cracks flare the entire way. Good gear is a challenge, but you can get it.