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Moissanite ( / ˈmɔɪsəˌnaɪt /) [ 5] is naturally occurring silicon carbide and its various crystalline polymorphs. It has the chemical formula SiC and is a rare mineral, discovered by the French chemist Henri Moissan in 1893. Silicon carbide or moissanite is useful for commercial and industrial applications due to its hardness, optical ...
A diamond simulant, diamond imitation or imitation diamond is an object or material with gemological characteristics similar to those of a diamond. Simulants are distinct from synthetic diamonds, which are actual diamonds exhibiting the same material properties as natural diamonds.
Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including ( clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...
Miami Beach Fire Station No. 1, which serves South Beach, needs to be replaced. Built in 1967, the station at 10th Street and Jefferson Avenue has electrical and mechanical issues, and a new one ...
The cause of the blaze remained under investigation as of Tuesday morning. The Sites Fire burns in Colusa County, California, as seen by a Cal Fire camera on Saint John Mountain shortly after 3:15 ...
Brian Atwater, a U.S. Geological Survey scientist emeritus, shows off tsunami-deposited mud. COPALIS BEACH, WASH. — When Japan issued its first-ever “megaquake” warning last week, Harold ...
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