Can copper be scratched by a fingernail or blade knife. why?

Can copper be scratched by a fingernail or blade knife. why?

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This Post Has 5 Comments

  1. it could by blade knife

    Explanation:

    fingernail has hardness 2.5; copper penny, about 3.5; a knife blade, 5.5

  2. 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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