EARTH SCIENCE
MINERALOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Quartz has hardness of 7 and will scratch on all the minerals with hardness 8 and higher.
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True
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False
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -Quartz has a hardness of 7. It can be scratched by all the minerals harder than 7 on the scale: topaz, corundum, and diamond. On the other hand, quartz can scratch minerals that are softer than 7, from feldspar to talc.
Detailed explanation-2: -Mohs Hardness Scale Quartz is a 7. It can be scratched by topaz, corundum, and diamond.
Detailed explanation-3: -By using a simple scratch test, you can determine the relative hardness of an unknown mineral. Select a fresh, clean surface on the specimen to be tested. Hold the specimen firmly and attempt to scratch it with the point of an object of known hardness. In this example, we use a sharp quartz (H=7) crystal .
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