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hard rock processing time flow chart

hard rock processing time flow chart

In simple terms hard rock scratches glass and steel usually signifying the minerals quartz or feldspar which has a Mohs hardness of 6 or higher Soft rock does not scratch steel but will scratch fingernails Mohs scale of 3 to 55 while very soft rock wont even scratch fingernails Mohs scale of 1 to 2

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