Image by Scott Brande
minerals - omg.georockme.com
igneous rock - igg.georockme.com
sedimentary rock - seg.georockme.com
metamorphic rock - meg.georockme.com
Minerals / Testing / Mohs Hardness web page
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https://omg.georockme.com/testing-mineral-properties/mohs-hardness#h.p_hLbVfqgAeObK
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