Chromium

kro'mi-um, a hard metal known chiefly to chemists. The name is derived from chrome, meaning color, and was given to this substance because it produces many-colored compounds. It has a bright, metallic luster, and is capable of a high polish, but it is difficult to melt. In nature it occurs in combination with iron ore. Naturally its production may be expected chiefly in iron regions. It is found abundantly in several states of the Union, but at present California is the American source of supply. It is produced in the Ural Mountains, in Greece, and in Austria, but the world's supply comes chiefly from a mine near Brusa in Asia Minor. By itself the element chromium is of no particular importance, but its compounds are valuable. A small amount added to steel produces so-called chrome steel, noted for its hardness. It is used in the manufacture of burglar-proof safes and edged tools. Chrome yellow and chrome green are used in staining glass, glazing porcelains, and as mineral dyes. In combination with potash, chromium is used in calico printing. The beautiful green of the precious emerald stone is thought to be due to a trace of chromium.