What is the hardness number of the mineral
Problem
A mineral can be scratched by a brass washer, but cannot be scratched by a copper coin.
1. Is this mineral hard or soft?
2. What is the hardness number of this mineral?
3. What mineral on Mohs Scale has this hardness?
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Is this mineral hard or soft? What is the hardness number of this mineral? What mineral on Mohs Scale has this hardness?
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