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Diamond: Mohs hardness 10
Diamond is the standard for Mohs hardness 10Photo (c) Andrew Alden, licensed to About.com (fair use policy)
Quartz: Mohs hardness 7
Quartz is the standard for Mohs hardness 7Geology Guide photo
Talc: Mohs hardness 1
Talc is the standard for Mohs hardness 1Geology Guide photo