| Answer | Crossword Clue |
|---|---|
| thorianite | a strongly radioactive mineral that is an oxide of thorium |
| thorianites | THORIANITE, a strongly radioactive mineral that is an oxide of thorium |
| autunite | a radioactive usually lemon-yellow calcium phosphate mineral that occurs in tabular crystals and in scales and that is an ore of uranium |
| magnetite | a black isometric mineral of the spinel group that is an oxide of iron and an important iron ore |
| monazites | a yellow to red or brown mineral that is a phosphate of thorium and various rare earth elements and occurs especially in sand and gravel deposits |
