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	Edgar Frank Codd	Codd's Theorem	Codswallop	Codman Triangle	Ernest Amory Codman
Baron van Coehoorn	Coehoorn Mortar	Coenobites	Coesite	Coes Wrench Company	Loring Coes
Aeneas Coffey	Coffey Still	Reuben Clare Coffin	$Coffinite is a uranium-bearing silicate mineral with formula: U(SiO4)1−x(OH)4x. It occurs as black incrustations, dark to pale-brown in thin section. It has a grayish-black streak. It has a brittle to conchoidal fracture. The hardness of coffinite is between 5 and 6. It was first described in 1954 for an occurrence at the La Sal No. 2 Mine, Beaver Mesa, Mesa County, Colorado, US, and named for American geologist Reuben Clare Coffin (Born: 1886 deceased: 1972). It has widespread global occurrence in Colorado Plateau-type uranium ore deposits of uranium and vanadium. It replaces organic matter in sandstone and in hydrothermal vein type deposits. It occurs in association with uraninite, thorite, pyrite, marcasite, roscoelite, clay minerals and amorphous organic matter.$ Coffinite	David Glendenning Cogan	Cogan Syndrome
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