Gneiss is a high grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock. Gneiss displays distinct foliation, representing alternating layers composed of different minerals.
Mountrail County is a county located in the U.S. state of North Dakota. As of the 2010 census, the population was 7,673. Its county seat is Stanley.
Greene County. Lead and zinc production in Greene County was from four main areas: Ash Grove, Brookline, Pickerel Creek and Pierson Creek. European use of mineralization in the Pierson Creek Area began in 1819, when Henry Rowe Schoolcraft noted lead in the area of the future Phelps Mine.