| Answer | Crossword Clue |
|---|---|
| SILICA | Mineral in quartz |
| SILEX | Mineral in the form of quartz or flint |
| ONYX | Quartz mineral |
| TOPAZ | Mineral slightly harder than quartz |
| ONYX | Quartz used in jewelry |
| AGATE | Quartz used in marbles |
| ONYX | Quartz used in making cameos. |
| AGATE | Colorful quartz in many marbles |
| SILICA | Stuff in sand or quartz |
