Discussion
A mineral that can be scratched by a steel knife but not by a copper coin has a hardness of about
Answer: D
Correct answer: 4 to 5
A copper coin is about 3.5 on the Mohs scale and a steel knife about 5.5, so a mineral scratched by the knife but not by the coin lies between them. The field tests are chosen for exactly this purpose: fingernail at about 2.5, coin at 3.5, knife at 5.5 and glass at about 5.5 bracket the common minerals.
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