Crossword puzzle clue "rock hardness scale"

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Answer
Clue
Relevancy
mohs
Clue
Rock hardness scale
Mineral-hardness scale name
Hardness scale
Mineral-hardness scale
Inventor of a mineral hardness scale
Hardness-scale inventor
apatite
Clue
It's 5 on the Mohs scale of hardness
Definition
a mineral, calcium fluoride phosphate, used as a fertilizer
garnet
Clue
It's 10 on the modified Mohs scale of hardness
Definition
a name given to various silicates, some semiprecious

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