The city of Atlanta, Georgia, in Fulton County, was an important rail and commercial center during the American Civil War. Although relatively small in population, the city became a critical point of contention during the Atlanta Campaign in 1864 when a powerful Union army approached from Union-held Tennessee.
Rare-earth compounds containing lanthanum are extensively used in carbon lighting applications, especially by the motion picture industry for studio lighting and projection.
Lanthanum, which is the first element of lanthanide series, is a silvery white metal and rare-earth element. Lanthanum can be mainly found in monazite and bastnasite. Although the source of lanthanum is not rare, but the process to get pure material is very complex.