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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).
If you're looking for elements in the lanthanide family, a good place to start would be in the earth's crust. Elements found in the earth's crust are called rare earth metals, and lanthanide elements are good examples of these. For instance, one of these rare earth metals is called lanthanide praseodymium. It's found in the earth ore monazite and is shown below. Let's step back in time a moment.