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coffinite

A naturally occurring uranium mineral, U(SiO4)1-x(OH)4x; sp gr, 5.1; luster adamantine; color black; commonly fine-grained and mixed with organic matter and other minerals. Found in Colorado, Utah, Wyoming, and Arizona. An important ore of uranium in some mines on the Colorado plateau.

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  • ed.young
  • (Milwaukee, United States)

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