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Uraninite, also known as pitchblende, is a radioactive, uranium-rich mineral and ore with a chemical composition that is largely UO 2 but because of oxidation typically contains variable proportions of U 3 O 8. Radioactive decay of the uranium causes the mineral to contain oxides of lead and trace amounts of helium.
The primary uranium ore mineral is uraninite (UO 2) (previously known as pitchblende). A range of other uranium minerals can be found in various deposits. These include carnotite, tyuyamunite, torbernite and autunite. [6] The davidite-brannerite-absite type uranium titanates, and the euxenite-fergusonite-samarskite group are other uranium minerals.
Autunite (hydrated calcium uranyl phosphate), with formula Ca(UO 2) 2 (PO 4) 2 ·10–12H 2 O, is a yellow-greenish fluorescent phosphate mineral with a hardness of 2– 2 + 1 ⁄ 2. [4] [5] Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals, commonly in small crusts or in fan-like masses.
Minerals in unoxidized sandstone are uraninite and coffinite; minerals in oxidized zones include carnotite and tyuyamunite. [59] An airborne gamma radiation survey flown by the US Atomic Energy Commission in 1954 discovered high radiation readings over the Cave Hills area in Harding County, in the northwest corner of the state. [60]
This is a list of minerals which have Wikipedia articles. ... Pitchblende (a massive impure form of uraninite) Plessite (mixture of kamacite and taenite)
Tyuyamunite is formed by the weathering of uraninite, a uranium-bearing mineral. Tyuyamunite, being a hydrous mineral, contains water. Yet when it is exposed to the atmosphere it loses its water. This process changes tyuyamunite into a different mineral known as metatyuyamunite [6] Ca(UO 2) 2 (VO 4) 2 ·3-5H 2 O. [7]
Production began in 1953. Ore minerals are uraninite and coffinite in unoxidized sandstone, and carnotite and tyuyamunite in oxidized sandstone. Gangue minerals in unoxidized deposits are pyrite, marcasite, and calcite; in oxidized deposits calcite and iron oxide. [6]
Uraninite, a reduced uranium ore mineral, accumulated within the permeable column of broken rock, forming a cylindrical and vertical (and stationary) rather than tabular and sub-horizontal (and migrating) uranium roll front deposit. Apparent mineralizing fluid flow direction was upward.