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21 February, 07:24

what is a mineral's estimated hardness if it can scratch a fingernail, penny, steel plate, and glass?

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  1. 21 February, 08:30
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    5.5

    Explanation:

    Instead, common objects are used as tools to perform the hardness test: fingernail (hardness = 2.5) copper penny (hardness = 3) glass plate or steel knife (hardness = 5.5)
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