Malachite is found in Russia, France, the Tyrol, England, Scotland, Ireland, Germany, Africa, Chili, Australia, and the United States. The finest specimens are found in the Urals—a block three and a half feet square, being valued at 525,000 roubles. JET. The making of jet or mourning jewelry was once a very large industry in France and England, and even now Whitby jet is well known in commerce. Jet is a species of bituminous coal (cannel coal) which can be cut with a knife. The hardness is 1 to 2.5; specific gravity, 1.35; its lustre is not very high, and color pitch-black. It is found in England, France, Hesse, Spain, Italy, and Prussia. AMBER. Amber is a fossil, and is not to be classed amongst minerals, but this material has always been used as an ornament, and a few notes will not be out of place here. This vegetable fossil, which has been known to the world for ages, the Greeks called electron. It is very light, having a specific gravity of 1.065 to 1.08, and is 2 to 2.5 in hardness. The principal color is yellow, in various shades, sometimes running into white or reddish-brown and black. Amber is transparent to translucent, possesses single refraction, a resinous lustre to a high degree, becomes electric by rubbing, and burns readily before the blow-pipe. Amber when heated becomes soft and pliable. Amber is composed of: Carbon 79. Hydrogen 10.5 Oxygen 10.5 Amber is imitated by gum copal, and even the insect enclosures which occur in real amber are copied. These imitations can be detected by placing the specimen in water or alcohol. This is also a good test for pieces of real amber that have been melted or glued together. Amber is thrown up by the sea, in rivers near the sea, or on the sea-shore, and has been found in nearly all parts of the world. The Russian, Baltic, and Sicilian coasts have yielded the larger portion of the production, but supplies come also from Galizia, the Urals, Poland, China, and the United States. For ornamental purposes the faceted amber beads are largely used, but of late years these have been closely imitated in glass. CORAL. Coral, although not a precious stone, has been largely used in jewelry, and as some of this beautiful substance is very valuable, a few words will not come amiss. Red or precious coral is the work of a family of zoöphytes which live mostly in cavities of rock in the sea. These polyps build their homes at a depth of two to seven hundred feet under the surface of the sea, and although the single groups of coral are sometimes several feet long, the usual size is about twelve inches high, and about one inch at the thickest part of any single branch. Coral is usually red, and rarely white or black, while the pale rose-pink is the most esteemed color. Coral is mostly found at Calle, off the coast of Africa, but also on the coasts of Tunis, Algiers, Corsica, Barbary, Majorca, and Minorca.