When it is exposed to weathering, a thin yellow-green coating of carnotite or tyuyamunite may form on its surface. |
Tyuyamunite is closely related to carnotite as indicated by the chemical formula. |
It is found in a number of minerals, including vanadinite, carnotite, roscoelite, and patronite. |
Pitchblende is the best, but carnotite, which is a gray rock with yellowish streaks, is also good ore. |
But it seems to be pulverized ore, and my guess would be carnotite. |
But couldn't the carnotite have been stolen from a privately owned mine? |