Freieslebenite is a very very rare silver, lead, antimony sulfide species found in good quality only at a few locales. The crystals here reach 4 mm and there are a hundred of them! This happens to be from the type locale, where it was noted circa 1773. I have never had a good German Freieslebenite, as Spanish material which came out in the late 1800s and early 1900s is more commonly seen. And, this is a large specimen, too - very richly covered! ex Robert Whitmore collection, obtained from Phil Scalisi in the past when he was selling the Grace Dearborn Collection (an heiress who assembled an excellent collection specializing in the classics in the early 1900s) .