| Answer | Crossword Clue |
|---|---|
| didymiums | DIDYMIUM, a mixture of rare earth elements |
| didymium | a mixture of rare earth elements |
| didymium | A mixture containing the rare earth elements praseodymium and neodymium, used to color glass for optical filters. It was originally regarded as a single element |
| 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 |
| yttriums | a metallic element usually included in the rare-earth group that occurs usually with other rare earth elements in minerals and is used especially in phosphors, YAG lasers, and superalloys see element table |
