- Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province, Potosi Department, Bolivia
- Thumbnail, 2.6 x 2.1 x 1.8 cm
Wurtzite is an uncommon zinc, iron sulfide, seldom found in well-developed crystals. This fine features a multitude of sharp, hexagonal, submetallic wurtzite crystals on massive wurtzite matrix from the famous Siglo XX Mine at Llallagua, Bolivia. Ex. George Elling Collection.