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6. What hardness is Topaz?

  • 9
  • 8
  • 6

7. Which reference mineral is hardness 10?

  • Diamond
  • Corundum
  • Quartz

8. What reference mineral is hardness 9?

  • Corundum
  • Topaz
  • Feldspar

9. What reference mineral is hardness 9

  • Diamond
  • Corundum
  • Quartz

10. Which reference mineral is easily scratched by a steel nail Fluorite or Apatite?

  • Both
  • Apatite
  • Fluorite

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?

  • glass
  • 2p coin
  • Fingernail

16. What hardness is Fluorite

  • 4
  • 8
  • 3

17. What reference mineral is hardness 5

  • Calcite
  • Apatite
  • Fluorite

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?

  • 2p coin
  • glass
  • fingernail

20. What reference mineral is hardness 4?

  • Topaz
  • Fluorite
  • Apatite