Uranium is not as rare as was once believed. Widely distributed in the Earth's

Uranium is a strongly electropositive element. This means that it is easily oxidized. In massive form the metal burns in air at 700c (1,292f). In finely divided form it is pyrophoric that is, it ignites spontaneously in air.

Approximately 90% of the remaining uranium minerals are uranyl compounds. No deposits of concentrated uranium ore have been discovered. As a result uranium must be extracted form ores containing less than 0.1% uranium, so that substantial, complex processing of the ores is required. Usually it is necessary to preconcentrate the ore by grinding and by the flotation process or similar processes.

When exposed to oxidizing conditions near or at the Earth's surface, most of the time uranium minerals are readily oxidized. Large deposits of this type, whic

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