Describe the nitrogen cycle and how it is affected by human activity. Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as NO2-, in a process known as fixation. The majority of nitrogen is fixed by bacteria, most of which are symbiotic with plants.
Tumble polished unakite pebbles. First discovered in the United States in the Unakas mountains of North Carolina from which it gets its name, unakite is an altered granite composed of pink orthoclase feldspar, green epidote, and generally colorless quartz. It exists in various shades of green and pink and is usually mottled in appearance.
Unakite and unakite-like rocks have been recovered from several places in the Blue Ridge Province of the eastern United States -- e.g., in Madison (e.g., near Bluff) and Mitchell counties, North Carolina; Unicoi County, Tennessee; and Augusta and Roanoke counties, Virginia.