Related Clues:
- "Twenty Questions" category
- Quartz, for one
- Agate mineral
- Quartz, e.g.
- Sand stuff
- Contents of a lode
- Stuff in those packets you're not supposed to eat
- Feldspar or cinnabar
- With 61-Across, prospectors' targets
- Geologist's concern
- Quartz component
- It's used in making glass
- Sand, essentially
- Quartz or feldspar
- Quartz compound