sphalerite is a mineral. its is a mixed zinc and iron sulfide. the chemical formula is (zn,fe)s. it can be brown, yellow, red, green, and black. it is normally found with galena, a lead ore. it is also known as zinc blende. it has a mohs hardness of 3.5 to 4. it is the main ore of zinc. it has a non-metalic sheen.