Piretite forms as crusts in association with an orange masuyite-like U-Pb oxide on the surface of uraninite samples ( Vochten, 1996 ).
22.
Uranium is found in hundreds of minerals, including uraninite ( the most common uranium ore ), carnotite, autunite, uranophane, torbernite, and coffinite.
23.
It occurs in association with columbite, zircon, monazite, uraninite, aeschynite, magnetite, albite, topaz, beryl, garnet, muscovite and biotite.
24.
Quartz pebble conglomerate hosted uranium deposits formed from the transport and deposition of uraninite in a fluvial sedimentary environment and are defined as stratiform and stratabound paleoplacer deposits.
25.
Uranium mostly occurs in the Earth's crust as a mixture of its oxides in the minerals uraninite, which is also called pitchblende because of its black color.
26.
Common uranous minerals include : uraninite; pitchblende ( a crystalline variant of uraninite ); and coffinite " ( Smith, Hutchinson and Blackwell, 1984 )"
27.
Common uranous minerals include : uraninite; pitchblende ( a crystalline variant of uraninite ); and coffinite " ( Smith, Hutchinson and Blackwell, 1984 )"
28.
While studying uraninite, on 21 December 1898, barium compounds, although some properties, such as the color of the flame test and spectral lines, were much different.
29.
It occurs as a hydrothermal mineral in medium temperature veins association with skutterudite, safflorite, lollingite, nickeline, native bismuth, native silver, algodonite, domeykite and uraninite.
30.
In nature, radium is found in uranium and ( to a lesser extent ) thorium ores in trace amounts as small as a seventh of a gram per ton of uraninite.