carnotite

/kahr-nuh-tahyt/US // ˈkɑr nəˌtaɪt //UK // (ˈkɑːnəˌtaɪt) //

鹦鹉石,鹦鹉岩,鹦鹉螺,鹦鹉螺石

Definitions

n.名词 noun

1
Mineralogy.
- : a yellow, earthy, hydrous potassium uranium vanadate: an ore of uranium.

Pitchblende is the best, but carnotite, which is a gray rock with yellowish streaks, is also good ore.
The powder is definitely carnotite, and it matches ore produced on the Colorado Plateau.
It's obvious that powdered carnotite was spread here before the corn was planted.
But couldn't the carnotite have been stolen from a privately owned mine?
But it seems to be pulverized ore, and my guess would be carnotite.