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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).
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  lanthanum, La, atomic number 57(noun) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth.