[HangnJudge]

... rare earth mineral

Not particularly rare, more common than lead for example
https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth’s_crust

[reg45]

Not a “rare earth”, the rare earths or lanthanides are from a particular region of the periodic table. Lithium, an alkali metal, is from the same group as sodium and potassium.