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Mineral Properties - Mohs Hardness Scale (Grade 7)

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Name: Date:
Use the chart to answer the questions about mineral hardness.

Mohs Hardness Scale
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TalcGypsumCalciteFluoriteApatiteOrthoclaseQuartzTopazCorundumDiamond
1. 
Talc is the softest mineral on Mohs Hardness Scale.
  1. True
  2. False
2. 
Gypsum will scratch talc.
  1. True
  2. False
3. 
Orthoclase will scratch corundum.
  1. True
  2. False
4. 
Quartz will scratch calcite.
  1. True
  2. False
5. 
Topaz will scratch diamond.
  1. True
  2. False
6. 
Which of these minerals is softest?
  1. fluorite
  2. gypsum
  3. corundum
  4. orthoclase
7. 
Which of these minerals is hardest?
  1. topaz
  2. quartz
  3. calcite
  4. apatite
8. 
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
9. 
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
10. 
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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