Rubies & sapphires rate a 9 on this scale of hardness named for a German mineralogist

Jeopardy
Carl Elias
February 17, 2022

If you are looking for the Rubies & sapphires rate a 9 on this scale of hardness named for a German mineralogist answer and solution then you have come to the right place. This question aired today (February 17 2022) in the popular Jeopardy! TV Show. If you would like to know the answer then continue reading below:

Question: Rubies & sapphires rate a 9 on this scale of hardness named for a German mineralogist

Answer: THE MOHS SCALE

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Carl Elias

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