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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.
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.
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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 ...
This is a list of minerals which have Wikipedia articles. ... Pitchblende (a massive impure form of uraninite) Plessite (mixture of kamacite and taenite)
Cerianite-(Ce) is a relatively rare oxide mineral, belonging to uraninite group with the formula (Ce,Th)O 2 . [ 4 ] [ 5 ] It is one of a few currently known minerals containing essential tetravalent cerium , the other examples being stetindite and dyrnaesite-(La) .
Thorianite is a rare thorium oxide mineral, ThO 2. [5] It was originally described by Ananda Coomaraswamy in 1904 as uraninite, [6] but recognized as a new species by Wyndham R. Dunstan. [7] It was so named by Dunstan on account of its high percentage of thorium; it also contains the oxides of uranium, lanthanum, cerium, praseodymium and neodymium.
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 ...