| Answer | Crossword Clue |
|---|---|
| INVAR | Alloy of nickel and iron |
| INVAR | Alloy of iron and nickel |
| MONEL | Nickel and copper alloy |
| NIFE | Hypothetical core material of the earth, supposedly nickel and iron: Geol. |
| COINS | Nickel and copper, but not iron |
| COBALT | Metal related to iron and nickel. |
| PEARLITE | Alloy of carbon and iron. |
| AICH | Yellow alloy of copper, zinc, and iron. |
| PEARLITE | Carbon and iron alloy. |
