| Answer | Crossword Clue |
|---|---|
| ALUMINA | White powder used as an abrasive. |
| EMERY | Rock powder used as an abrasive |
| EMERYCLOTH | Fabric used as an abrasive |
| ROTTENSTONE | Powdered rock used as an abrasive |
| WIREWOOL | Steel fibers used as an abrasive |
| YTTRIA | White powder used in incandescent gas |
| BORAX | White powder used in cleaning products |
| THORIA | White, earthy powder used for optical glass |
