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%