Geography, 08.04.2020 01:05 rconyers00
The mineral calcite can be scratched by a copper penny but cannot be scratched by a fingernail. According to Moh's scale of hardness, the hardness of calcite is .
A. 7
B. 1
C. 2
D. 5
E. 3
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The mineral calcite can be scratched by a copper penny but cannot be scratched by a fingernail. Acco...
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