GEOLOGY
GEOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Copper Penny has a hardness of
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3
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3.5
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5
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None of the above
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Explanation:
Detailed explanation-1: -On the Mohs scale, fingernail has hardness 2.5; copper penny, about 3.5; a knife blade, 5.5; window glass, 5.5; steel file, 6.5. Using these ordinary materials of known hardness can be a simple way to approximate the position of a mineral on the scale.
Detailed explanation-2: -With a hardness of approximately 3, a copper penny easily scratches a specimen of gypsum (hardness 2).
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