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).
Where diamonds are found in the United States - Wyoming. Diamond Kimberlite pipes have been found in Wyoming, near the Colorado-Wyoming state line area referred to as the Aultman, Ferris and Schaffer kimberlites. The Herkimer Diamond Mine and the Ace Of Diamonds Mine - New York.
Placer Diamonds in the Northwest Territories. Diamond Mining in the U.S.A. Space Diamonds / Carbonado. For whatever reason, very few miners are looking for diamonds in the U.S. That is a real shame, because the U.S.A. sits on an extremely old massive Craton. Cratons are the earth's diamond making factories, 150-250 miles down.