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Quartz, comes in many different types & hardnessses. Depending on what it is crystallized with, & the compacting of the granular structure. Thus Quartz can be a 5 MOH, Quartzite a 7 MOH, & Quartzatite a 9 MOH.
Quartz, comes in many different types & hardnessses. Depending on what it is crystallized with, & the compacting of the granular structure. Thus Quartz can be a 5 MOH, Quartzite a 7 MOH, & Quartzatite a 9 MOH.