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. (September 22, 2018). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/mohs-scale-hardness
"Mohs scale of hardness." World Encyclopedia. . Retrieved September 22, 2018 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/mohs-scale-hardness
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