The gold ore comes from the quartz veins containing pyrrhotite, pyrite, galena and zinc blende. Crystallographically the structure of chalcopyrite is closely related to that of zinc blende ZnS (sphalerite). The more stable cubic form is known also as zinc blende or sphalerite. GaSb is a III-V semiconductor with the zinc blende crystal structure. The lattice constant for zinc sulfide in the zinc blende crystal structure is 0.541 nm. AlGaInP's structure is categorized within a specific unit cell called the "zinc blende structure". Another fragile candidate mineral is sphalerite (zinc blende). The main yields were lead and zinc ores, in particular galena, blende, cerussite and gossan. It is a III-V direct band gap semiconductor with a zinc blende crystal structure. The mines yielded a rich output of zinc blende, lead ore and silver. Pitche Blende, however, remained experimental in nature. In 1875 11,898 tons of zinc blende was extracted, in 1877 186,019 ounces of silver. The most common zinc ore is sphalerite (zinc blende), a zinc sulfide mineral. Zinc blende/sphalerite is based on a FCC lattice of anions. Pitche Blende was an American garage rock/psychedelic rock band formed in 1967, in Saginaw, Michigan.