獨居石
Monazite \Mon"a*zite\ (m[o^]n"[.a]*z[imac]t), n. [From Gr. mona`zein to be solitary, in allusion to its isolated crystals.] (Min.) A mineral occurring usually in small isolated crystals, -- a phosphate of the cerium metals.
monazite n : a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium