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China is a major global producer of many raw materials, and, in some cases, a dominant producer. Particular concern has been raised in the United States and elsewhere over China's near-monopoly in the production of "rare earths"-a group of 17 elements whose unique properties make them critical in a variety of advanced technologies. Due to their special properties of magnetism, luminescence, and strength, rare earths are widely used in high-technology and clean energy products, as well as in military weapon systems. According to one analyst, rare earth elements "are critical to hundreds of high tech applications, many of which define our modern way of life. Without rare earth elements, much of the world's modern technology would be vastly different, and many applications would not be possible."