Rare form of in rare form.

(chemistry) Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts; they include the lanthanides plus yttrium, scandium, thorium and sometimes zirconium.

Strong, permanent magnets that are made from alloys of rare earth elements, are much stronger than ferrite or alnico magnets, and are extremely brittle.

A sedge species, Carex ericetorum (in Carex subg. Carex).

plural of rare earth element

plural of rare spring-sedge

A mineral that contains one or more rare earth elements as major metal constituents.

rare earth element

plural of rare earth metal

plural of rare earth mineral