Coffinite

Name:
Coffinite
Detailed information:

M Formula:	U(SiO4)l-x(OH)4x, (or USiO4, with appreciable (OH)4 in place of some SiO4)
Properties:
Black color; adamantine luster; commonly fine grained, mixed with organic matter and other minerals. D 5.1.
Occurrence:
Colorado, Utah, Wyoming, Arizona.
Use:
Ore of uranium (Colorado).