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An unknown mineral sample scratches a glass plate but cannot be scratched by a carpenter's nail. For identification purposes, how is the mineral's hardness described?
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An unknown mineral sample scratches a glass plate but cannot be scratched by a carpenter's nail. For identification purposes, how is the mineral's hardness described?

User Crickeys
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The minerals hardness is described as stronger than glass and weaker than a nail. Its would be 6.4 ~ 5.6
User Reghunaath A A
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