Mineral Properties - Mohs Hardness Scale (Grade 7)
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Use the chart to answer the questions about mineral hardness.
Mohs Hardness Scale | |||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
Talc | Gypsum | Calcite | Fluorite | Apatite | Orthoclase | Quartz | Topaz | Corundum | Diamond |
1.
Talc is the softest mineral on Mohs Hardness Scale.
- True
- False
2.
Gypsum will scratch talc.
- True
- False
3.
Orthoclase will scratch corundum.
- True
- False
4.
Quartz will scratch calcite.
- True
- False
5.
Topaz will scratch diamond.
- True
- False
6.
Which of these minerals is softest?
- fluorite
- gypsum
- corundum
- orthoclase
7.
Which of these minerals is hardest?
- topaz
- quartz
- calcite
- apatite
8.
Which statement comparing mineral hardness is true?
- calcite will only scratch gypsum
- calcite will only scratch gypsum and talc
- calcite will scratch any mineral softer than 3
- 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?
- less than 3
- more than 7
- less than 7 and more than 6
- 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?
- quartz
- calcite
- apatite
- gypsum
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