Carborundum stone wire wrapped in a copper silver coated wire. The strand has natural stones, glass crystals, various beads. Enjoy this unique, interesting, and stunning piece of Earth.Carborundum is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite. Synthetic SiC powder has been mass-produced since 1893 for use as an abrasive. Grains of silicon carbide can be bonded together by sintering to form very hard ceramics that are widely used in applications requiring high endurance, such as car brakes, car clutches and ceramic plates in bulletproof vests. Electronic applications of silicon carbide such as light-emitting diodes (LEDs) and detectors in early radios were first demonstrated around 1907. SiC is used in semiconductor electronics devices that operate at high temperatures or high voltages, or both. Large single crystals of silicon carbide can be grown by the Lely method and they can be cut into gems known as synthetic moissanite. It is also used as an abbrasive to finely polish stones and other hard surfaces.Another use of this material is in sandpaper and rock tumbling machines that use the fine powder of the Carborundum to polish and form the stonesCarborundum, stones, wire, acrylic beads, glass crystals. The materials are all natural and will do well in an outside environment.