Across
- 6. this is used for hydrofluoric acid and has a harness of 4.
- 7. this is used for steel and it is magnetic
- 9. this is used for construction materials and comes in thin flexible sheets.
- 10. this has a hardness of 5-6 and cleaves in two directions
- 11. this has a hardness of 5.5 and comes in colors of black-green.
- 13. this mineral is used for batteries and is a metallic silver.
- 17. this can be easily scratched by a fingernail and is used for plaster of paris.
- 18. this bubbles with acid and is used for cement.
- 19. this mineral has a greasy feel, and is used for ceramics
- 20. this mineral can melt ice and has a hardness of 2.5
- 21. this mineral is brassy yellow, used for ore of sulfur.
Down
- 1. this has a white-yellow streak and is used for sulfuric acid.
- 2. this mineral is white-gray, and is used for ceramics and glass.
- 3. this is used for paint and roofing and comes in colors of colorless to yellow.
- 4. this mineral comes in colors of dark red-green and has a very high harness of 6.5 to 7.5.
- 5. this has a red-brown streak and is used for ore of iron.
- 8. this is used for furnace bricks and has a hardness of 6.5
- 12. this mineral has a hardness of 1-2 and is used for pencil lead.
- 14. this is used for ceramics and glass and cleaves in 2 directions.
- 15. this bubbles with acid when powdered and is used for building stones.
- 16. this mineral can form hexagonal crystals and is used for glass jewelry.