| Answer | Crossword Clue |
|---|---|
| samarskites | SAMARSKITE, a black mineral containing uranium |
| samarskite | a black mineral containing uranium |
| andradite | A mineral of the garnet group, containing calcium and iron. It occurs as yellow, green, brown, or black crystals, sometimes of gem quality |
| uraninite | mineral, probably originally uranium dioxide, UO2, but altered by radioactive decay, and usually containing uranium trioxide, lead, radium, and helium, occurring in several varieties, including pitchblende: the most important ore of uranium |
| euxenite | rare, brownish-black mineral of complex composition, an oxide of calcium, cerium, yttrium, columbium, titanium, and uranium |
