A specimen from what has to be my favorite find of the trip-- tetrahedrite on quartz .
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.
There is some peripheral damage to the quartz.