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6. What hardness is Topaz?
7. Which reference mineral is hardness 10?
8. What reference mineral is hardness 9?
9. What reference mineral is hardness 9
10. Which reference mineral is easily scratched by a steel nail Fluorite or Apatite?
11. What scratches Corundum
- Steel nail but only just
- Nothing, it scratches glass
- Steel nail
12. Which is softer Talc or Quartz?
- Talc
- Quartz
- Niether, they are the same hardness
13. Which reference mineral(s) can be scratched by a fingernail?
- Talc, Gypsum
- Gypsum, Quartz
- Topaz
14. Put Apatite, Calcite and Fluorite in order of decreasing hardness
- Fluorite, Calcite, Apatite
- Apatite, Fluorite, Calcite
- Calcite, Fluorite, Apatite
15. What scratches Calcite?
16. What hardness is Fluorite
17. What reference mineral is hardness 5
18. What scratches hardness 7+ reference minerals?
- Nothing, they scratch glass
- An Aluminium blade
- Nothing, they are to fragile to scratch
19. What scratches Calcite?
20. What reference mineral is hardness 4?