Mohs scale of hardness
Simple hardness test
Crushed by fingernail
Scratched by fingernail
Scratched by copper coin
Scratched by glass
Scratched by knife blade
Scratched by quartz
Scratched by steel file
Scratched by corundum
Scratched by diamond
"Mohs scale of hardness." World Encyclopedia. . Encyclopedia.com. (January 17, 2019). https://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/mohs-scale-hardness
"Mohs scale of hardness." World Encyclopedia. . Retrieved January 17, 2019 from Encyclopedia.com: https://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/mohs-scale-hardness
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