Page:Radio-activity.djvu/579

 Name                Composition                               Remarks

Uraninite        Oxides of uranium and lead. Occurs primary as a Cleveite         Usually contains thorium,                 constituent of rocks and Bröggerite       other rare earths and helium              secondary in veins with Nivenite         Uranium 50-80%                            metalliferous sulphides Pitchblende      Thorium 0-10%

Gummite          (Pb, Ca) U_{3}SiO_{12}. 6H_{2}O? An alteration product of                 Uranium 50-65%                             uraninite. Formed by the action of percolating waters

Uranophane       CaO. 2UO_{3}. 2SiO_{2}. 6H_{2}O Uranotil         Uranium 44-56%                             An alteration product of                                                             uraninite through gummite

Carnotite        A vanadate of uranium and                  Occurs as a secondary potassium                                 mineral impregnating a                  Uranium 42-51%                             porous, sedimentary sandstone. Found in Colorado and Utah

Uranosphaerite   Bi_{2}O_{3}. 2UO_{3}. 3H_{2}O           Alteration product of                  Uranium 41%                                other uranium minerals

Torbernite       CuO. 2UO_{3}. P_{2}O_{5}. 8H_{2}O            "      " Cuprouranite     Uranium 44-51%                                   "      "

Autunite         CaO. 2UO_{3}. P_{2}O_{5}. 8H_{2}O            "      " Calciouranite    Uranium 45-51%                                   "      "

Uranocircite     BaO. 2UO_{3}. P_{2}O_{5}. 8H_{2}O            "      " Uranium 46%

Phosphuranylite  3UO_{3}. P_{2}O_{5}. 6H_{2}O                  "      " Uranium 58-64%

Zunerite         CuO. 2UO_{3}. As_{2}O_{5}. 8H_{2}O           "      " Uranium 46%

Uranospinite     CaO. 2UO_{3}. As_{2}O_{5}. 8H_{2}O           "      " Uranium 49%

Walpurgite       5Bi_{2}O_{3}. 3UO_{3}. As_{2}O_{5}. 12H_{2}O "      " Uranium 16%

Thorogummite     UO_{3}. 3ThO_{2}. 3SiO_{2}. 6H_{2}O? A variety of gummite Uranium 41%

Thorite          ThSiO_{4}                                  A primary constituent of Orangite          Uranium 1-10%                              pegmatite dikes Uranothorite     Thorium oxide 48-71%

Thorianite       Oxide of thorium, uranium,                 Occurs as a primary constituent the rare earths and lead. of a pegmatite Contains a relatively large               dike in Ceylon. Geological proportion of helium. age probably Archean Uranium 9-10% Thorium oxide 73-77%