Chalcopyrite on Chalcocite on Quartz

A HIGHLY unusual specimen consisting of a stout Quartz crystal completely coated with Chalcocite and enhanced by brassy Chalcopyrites. Terminated on one end. A must for the Missouri or Pea Ridge collector. First and only one I have personally seen.

Locality: Pea Ridge Mine, Washington County, Missouri

Composition: copper iron sulfide on copper sulfide on silicon dioxide