Mineral Many sulfide minerals are economically important as metal ores; examples include sphalerite (ZnS), an ore of zinc, galena (PbS), an ore of lead, cinnabar (HgS), an ore of mercury, and molybdenite (MoS, an ore of molybdenum. Pyrite (FeS), is the most commonly occurring sulfide, and can be found in most geological environments. It is not, however, an ore of iron, but can be instead oxidized to produce sulfuric acid. Related to the sulfides are the rare sulfosalts, in which a metallic element is bonded to sulfur and a semimetal such as antimony, arsenic, or bismuth. Like the sulfides, sulfosalts are
Galena, Alaska upon the closure of Galena Air Force Station. As Galena is incorporated as a first-class city and located in the Unorganized Borough, it is required by state law to operate its own schools, Galena City School District, apart from the Rural Education Attendance Areas which otherwise prevail outside of incorporated boroughs. Along with other such cities across Alaska, Galena's school district operates a boarding school and a correspondence study program, to increase state funding which would not otherwise be available with the local pupil base. Galena has three schools. Galena City School is primarily for local K–12 students. There is