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8 February, 09:37

A human fingernail has a hardness of approximately 2.5. Which mineral is softer than a finger nail. A. calcite B. gypsum C. apatite D. diamond

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  1. 8 February, 09:56
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    According to the 2011 Earth Science Reference Table, Selenite Gypsum has an approximate hardness of 2.

    The hardness of calcite is 3.

    The hardness of apatite is 5 according to the Moh's hardness scale.

    The hardness of diamond is 10.
  2. 8 February, 12:32
    0
    That answer would be, B. gypsum

    -Nana
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