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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 ...
Uranium minerals are typically uraninite with lesser uranothorite, brannerite, and coffinite. The uranium is especially concentrated along thin carbonaceous seams or carbon leaders. Strong regional scale alteration consists of pyrophyllite, chloritoid, muscovite, chlorite, quartz, rutile, and pyrite. The main elements associated with the ...
Coffinite is metastable [14] compared to uraninite and quartz, thus formation of coffinite requires a uranium source in reducing conditions, as evidenced by the associated presence of low-valence vanadium minerals. [8] Silica-rich solution provides such a reducing condition in cases where coffinite results as an alteration product of uraninite ...
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.
The uranium mineral is most commonly uraninite, which occurs with pyrite, marcasite, and chalcopyrite. The orebodies are in veins or strataform deposits within one-half mile of diabase intrusions. [ 4 ]
It is found in many minerals including uraninite (the most common uranium ore), autunite, uranophane, torbernite, and coffinite. [7] There are significant concentrations of uranium in some substances, such as phosphate rock deposits, and minerals such as lignite, and monazite sands in uranium-rich ores. (It is recovered commercially from these ...
Uranium is present as uraninite, coffinite, and meta-autunite in Eocene and Oligocene arkosic sandstone, conglomerate, and in sediments interbedded with Miocene volcanic flows. Uranium is associated with carbonaceous material, and pyrite. The source of uranium is thought to be the Oligocene Wall Mountain Tuff. [28]
Uraninite, an ore that is mostly uranium dioxide (UO 2) Yellowcake forgery, fraudulently depicted Saddam Hussein trying to buy uranium powder; Sequoyah Fuels Corporation, an American company involved in yellowcake processing; COMINAK, a Niger uranium mining and processing company; SOMAIR, a Niger uranium mining and processing company