Orthoclase Feldspar Hardness: Mohs Scale & Scratch Resistance

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Orthoclase Feldspar Hardness: Mohs Scale & Scratch Resistance

Orthoclase feldspar has a Mohs hardness of 6.

This means that it can scratch glass (which has a hardness of 5.5), but it can be scratched by quartz (which has a hardness of 7).

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