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What could the hardness of a mineral be if it can be scratched by a cent coin?
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What could the hardness of a mineral be if it can be scratched by a cent coin?

User Idnavid
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The hardness of a mineral can be 3 or less
User Mahdi Taghizadeh
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It can become any of these things, Gypsum, Calcite, Fluorite, or Apatite
User Michael Gaylord
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