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What would you expect to happen if you rubbed a mineral of hardness 7.5 against a piece of quartz?
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What would you expect to happen if you rubbed a mineral of hardness 7.5 against a piece of quartz?

User Osyotr
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Quartz also has a hardness level of 7.5, so rubbing another mineral with a 7.5 will not affect it. Hope this helps
User Innospark
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you would expect a scratch on the quartz since quartz is on a hardness scale of 7 and the mineral you are rubbing against it is at a hardness scale of 7.5
User ZpfSysn
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6.2k points
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