Hardness of Crystal

- Aug 19, 2019-

Hardness: mohs hardness 7, mohs hardness, as hard as a steel file.In 1824, an Austrian mineralogist named frich Morse took out 10 varieties of many minerals and measured their relative hardness through scientific experiments.Although the more scientific northrop grumman hardness tester was later used and promoted by the national bureau of standards, jewelers in many countries around the world are still accustomed to the mohs hardness scale.

In Addition:

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