[Chemical composition] In addition to UO 2 , the composition often contains UO 3 , which contains PbO due to radioactive catalysis (sometimes as high as 10% to 20%)
And also often Th (up to 28%), and rare earth elements (up to 12%).
[crystal structure] equiaxed crystal system; 
a 0 = 0.546 nm; Z = 4. Crystal
The structure is of the fluorite type (CaF 2 ) (see description in the halide class).
[Form] There are often simple shapes such as cube {100}, octahedron {111}, and rhombohedron {110}. The aggregates are usually dispersed in fine particles. The shape of the kidney, stalactite, grape or dense block is called asphalt uranium . The amorphous earthy and powdery ones are called uranium black.
[Physical properties] black; brown-black streak; uraninite semi-gloss metallic luster to a resin, predominantly pitchblende asphalt gloss, and the uranium is glossy dark black. No cleavage; shell-like fracture or jagged fracture. The hardness of the crystalline uranium mine is 5-6, the asphalt uranium mine is 3-5, and the uranium black is 1-4. The relative density of crystalline uranium ore is generally about 10. When U is increased by the substitution of elements such as Th and rare earth or the degree of radioactive enthalpy increases, the relative density tends to decrease. The relative density of the uranium ore is 6.5-8.5. Strongly radioactive.
[genesis and occurrence] The crystalline uranium ore is produced in a small amount in granitic pegmatite and is symbiotic with minerals containing rare earth and Th, Nb and Ta.
Pitchblende often seen cobalt, nickel, arsenic and bismuth compounds in the silver sulfide epithermal Causes veins. Uranium black is formed by partial oxidation of uranium minerals in the primary uranium deposit or by partial reduction of UO 3 leached from the oxidized zone. The former is produced in the oxidation zone and is called residual uranium black. The latter is found in the cementation zone under the oxidation zone.
[Identification features] characterized by its black, asphalt luster, relative density and strong radioactivity.
[Main use] is a raw material for the atomic energy industry, and can extract radium and rare earth elements.
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