mineral solid homogeneous inorganic substances occurring in nature having a definite chemical composition
atomic number 58,
ce,
cerium a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group
atomic number 60,
neodymium,
nd a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium
atomic number 59,
praseodymium,
pr a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
