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Mineral Properties - Mohs Hardness Scale (Grade 7)

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Use the chart to answer the questions about mineral hardness.

Mohs Hardness Scale
Talc is the softest mineral on Mohs Hardness Scale.
  1. True
  2. False
Gypsum will scratch talc.
  1. True
  2. False
Orthoclase will scratch corundum.
  1. True
  2. False
Quartz will scratch calcite.
  1. True
  2. False
Topaz will scratch diamond.
  1. True
  2. False
Which of these minerals is softest?
  1. fluorite
  2. gypsum
  3. corundum
  4. orthoclase
Which of these minerals is hardest?
  1. topaz
  2. quartz
  3. calcite
  4. apatite
Which statement comparing mineral hardness is true?
  1. calcite will only scratch gypsum
  2. calcite will only scratch gypsum and talc
  3. calcite will scratch any mineral softer than 3
  4. calcite will scratch any mineral harder than 3
An unidentified mineral can be scratched by orthoclase, but not by calcite. Which of the following best describes the mineral's hardness?
  1. less than 3
  2. more than 7
  3. less than 7 and more than 6
  4. more than 3 and less than 6
Mike is identifying a mineral. His mineral scratches fluorite, but not orthoclase. Which could be Mike's mineral?
  1. quartz
  2. calcite
  3. apatite
  4. gypsum
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