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IMSO 2008 Science – Taiwan Selection First Round Theory Question 15

IMSO Science · IMSO 2008 Science – Taiwan Selection First Round Theory

Question 15

The Mohs scale for minerals is shown below. An unknown mineral can be scratched by topaz, but not by feldspar. According to the Mohs scale, which of the following best describes the hardness of the unknown mineral?

Question illustration
  1. less than 5
  2. more than 8
  3. less than 8, but more than 6
  4. more than 4, but less than 6