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A mineral scratches a piece of fluorite but cannot be scratched by a piece of glass. What is this mineral’s hardness?
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A mineral scratches a piece of fluorite but cannot be scratched by a piece of glass. What is this mineral’s hardness?

User Seamus Leahy
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Answer:

The mineral's hardness is greater than 4 but less than 5.5 on the Mohs hardness scale.

User HaleFx
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