- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
- Toenail, 3.0 x 2.2 x 2.1 cm
Wurtzite is an uncommon zinc, iron sulfide, seldom found in well-developed crystals. This fine specimen features booklets of sharp, hexagonal, submetallic wurtzite crystals aesthetically set on quartz matrix and accented with brassy chalcopyrite from the Siglo Veinte Mine at Llallagua, Bolivia. The wurtzite crystal clusters look like classic, textbook hematite "iron roses." The important aspect of this specimen is that these are actual crystals and not small massive "blebs." Ex. Dick Jones Collection.