| Name | Composition | Remarks |
|---|---|---|
| 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? Uranium 41% | A variety of gummite |
| Thorite, Orangite, Uranothorite | ThSiO 4 . Uranium 1–10%. Thorium oxide 48–71% | A primary constituent of pegmatite dikes |
| Thorianite | Oxide of thorium, uranium, the rare earths and lead. Contains a relatively large proportion of helium. Uranium 9–10%. Thorium oxide 73–77% | Occurs as a primary constituent of a pegmatite dike in Ceylon. Geological age probably Archean |
| Samarskite | Niobate and tantalate of rare earths. Uranium 8–10% | Primary constituent of pegmatite dikes |
| Fergusonite | Metaniobate and tantalate of rare earths. Uranium 1–6% | „ „ |
| Euxenite | Niobate and titanate of rare earths. Uranium 3–10% | „ „ |
| Monazite | Phosphate of the rare earths, chiefly cerium. Uranium 0·3–0·4% | „ „ |
Table of Contents
APPENDIX B. RADIO-ACTIVE MINERALS.
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