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Uraninite crystals from Topsham, Maine (size: 2.7 × 2.4 × 1.4 cm) Uraninite is a major ore of uranium. Some of the highest-grade uranium ores in the world were found in the Shinkolobwe mine in the Democratic Republic of the Congo (the initial source for the Manhattan Project) and in the Athabasca Basin in northern Saskatchewan, Canada.
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 ...
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.
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
Mining began in 1859 not only for the products which resulted from uraninite's decomposition, but for uraninite itself. A variety of yellow paints were manufactured because among all the secondary minerals on the pit-heap there was a prevalence of the yellow powdery coatings. Zippeite is one of the so-called 'uranium ochres'.
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.
Schoepite, empirical formula (UO 2) 8 O 2 (OH) 12 ·12(H 2 O) [2] is a rare alteration product of uraninite in hydrothermal uranium deposits. It may also form directly from ianthinite. The mineral presents as a transparent to translucent yellow, lemon yellow, brownish yellow, or amber orthorhombic tabular crystals. Although over 20 other ...
Thorianite and uraninite form a complete solid solution series in synthetic and natural material. [10] The division between the two species is at Th:U = 1:1 with U possibly making up to 46.50% and Th ranging up to 87.88%. [11] Rare earths, chiefly Ce, substitute for Th in amounts up to 8% by weight. [10] [12] Ce is probably present as Ce 4+.