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Scandium, skan′di-um, n. an element discovered in 1879 in the Scandinavian mineral euxenite.

The element is of extremely rare occurrence, being met with only in argyrodite and, to a very small extent, in euxenite.

The rare earth metals are found in the minerals gadolinite, samarskite, fergusonite, euxenite and cerite.

It is usually found associated with tantalum, the chief minerals containing these two elements being tantalite, columbite, fergusonite and yttrotantalite; it is also a constituent of pyrochlor, euxenite and samarskite.

The substances occur, in very minute quantity, in a large number of sparingly-distributed and comparatively rare minerals—euxenite, samarksite, cerite, yttrotantalite, &c.