Scandium is a chemical element with symbol Sc and atomic number 21. A silvery-white metallic d-block element, it has historically been sometimes classified as a rare earth element, together with yttrium and the lanthanoids. It was discovered in 1879 by spectral analysis of the minerals euxenite and gadolinite from Scandinavia.
S 3152 (OTTO) Scandium sputtering target, diam. x thickness 2 inch x 0.125 inch, 99.995% Cas 7440-20-2 - used in aluminium-scandium alloys for minor aerospace industry components.