Biology, 06.03.2021 01:00 RealGibbon857

The hardness of a steel nail is about 5.5 a certain mineral scratches a steel nail but does not scratch quartz. What could the hardness of mineral be

The hardness of a steel nail is about 5.5 a certain mineral scratches a steel nail but does not scr

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The hardness of a steel nail is about 5.5 a certain mineral scratches a steel nail but does not scra...