Thermoplastics, in basic terms, are melt-processable plastics (materials that are processed with heat). When enough heat is added to bring the temperature of the plastic above its melt point, the plastic liquefies (softens enough to be processed).
In the U.S., diamonds have been found in Arkansas, Colorado, Wyoming, and Montana. In 2004, the discovery of a microscopic diamond in the U.S. led to the January 2008 bulk-sampling of kimberlite pipes in a remote part of Montana.
Mining For Diamonds In The Canadian Rough. Mining For Diamonds In The Canadian Rough. Located approximately 130 miles south of the Arctic Circle, the Diavik Diamond Mine, seen here during the winter, is Canada's largest diamond producer.