A specimen from what has to be my favorite find of the trip-- a tetrahedrite crystal on an almost fractal quartz. The habit of quartz on this piece and the positioning of the tetrahedrite make for a particularly beautiful specimen.
The tetrahedrite is coated with tiny crystals of bournonite, and comes from a find made within the last several months. I saw a couple flats of this material in Tucson, but all were off matrix and had major damage issues. I saw one good lot of specimens while in Peru, this piece comes from that group.