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Lanthanum is considered a rare earth metal because the process to mine it is difficult, time-consuming and expensive. Lanthanum is rarely the dominant lanthanide found in the rare earth minerals, and in their chemical formulae it is usually preceded by cerium. Rare examples of La-dominant minerals are monazite-(La) and lanthanite-(La).
It gave its name to the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table: it is also sometimes considered the first element of the 6th-period transition metals. As such, it almost always assumes the oxidation state +3.lthough it is classified as a rare earth element, lanthanum is the 28th most abundant element in the Earth's crust, being just under three times as abundant as lead. In minerals such as monazite and bastnaesite, bastnÃ¤site lanthanum makes up over a quarter of the lanthanide. content