# 그림:MonaziteUSGOV.jpg

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Monazite

Thorium is a silvery radioactive, metallic element. The primary source of the world's thorium is the rare-earth-and-thorium-phosphate mineral monazite. Monazite is not recovered as a salable product in the United States. Past production had been as a byproduct of titanium and zirconium mineral processing during which monazite was recovered for its rare-earth content. Nonenergy uses of thorium include high-temperature ceramics, catalysts, and welding electrodes. No thorium production or consumption has been reported in the United States for several years.

Source: http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/photogallery/ ; English Wikipedia, original upload 3 August 2004 by Chris 73

| This image is a work of the "Minerals in Your World" project, a cooperative effort between the United States Geological Survey and the Mineral Information Institute. The images were featured in the "Minerals and Materials Photo Gallery" on the website of the U.S House Subcommittee on Energy and Natural Resources. As a work of the U.S. federal government, the image is in the public domain. |

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