Casapalca Mine, Casapalca, Huarochiri Province, Lima Department, Peru
2.4 x1.9 x .7 inches
$35

A wonderful example of tetrahedrite from this famous locale. The crystals have rather complex faces and alterations which are very attractive in person (although they did make photographing the specimen somewhat difficult - the specimen is outstanding in person). The complex faces make for flashes of metallic luster when viewed at different angles.