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

The answer is 3.

Explanation:

MOHS' SCALE OF HARDNESS

MineralHardness  

Fluorite4Elmwood mine, Tennessee 2.5 cm. (note phantom)

Calcite3Elmwood Mine, Tennessee 8 cm. (twinned)

Gypsum2Wyoming 12 cm. Note "fishtail" twin on left

Talc1Rope's Gold Mine, Michigan (green) 4 cm. across talc mass

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