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On the Mohs scale, hardness 1 and hardness 10 are represented respectively by

  • A.gypsum and corundum
  • B.calcite and quartz
  • C.talc and diamond
  • D.diamond and talc

Answer: C

The scale is ordinal rather than proportional, so diamond is very much more than ten times as hard as talc. Quartz at 7 is the practical dividing line, since it will scratch window glass and a steel knife will not scratch it.

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