CRS – Rare Earth Elements in National Defense: Background, Oversight Issues, and Options for Congress. Valerie Bailey Grasso, Specialist in Defense Acquisition. September 17, 2013

“Some Members of Congress have expressed concern over U.S. acquisition of rare earth materials composed of rare earth elements used in various components of defense weapon systems. Rare earth elements consist of 17 elements on the periodic table, including 15 elements beginning with atomic number 57 (lanthanum) and extending through number 71 (lutetium), as well as two other elements having similar properties (yttrium and scandium). These are referred to as “rare” because although relatively abundant in total quantity, they appear in low concentrations in the earth’s crust and extraction and processing is both difficult and costly. In 2010, a series of events and press reports highlighted what some referred to as the rare earth “crisis…Some policymakers were concerned that China had cut its rare earth exports and appeared to be restricting the world’s access to rare earths, with a nearly total U.S. dependence on China for rare earth elements, including oxides, phosphors, metals, alloys, and magnets. Additionally, some policymakers had expressed growing concern that the United States had lost its domestic capacity to produce strategic and critical materials, and its implications for U.S. national security.”