The uranium used in nuclear reactors comes largely from the complex potassium-, uranium-, vanadium-bearing mineral called carnotite found in some sedimentary rocks.

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Carnotite is indeed a significant source of uranium for nuclear reactors, and it is a potassium-uranium-vanadate mineral found in sedimentary rocks, particularly in sandstones. This mineral is mined for its uranium content, which is processed and enriched for use in nuclear fuel.

The Uranium Used in Nuclear Reactors Comes Largely from the Complex