Which mineral among Fluorite, Apatite, and Feldspar has the highest Mohs hardness?

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Multiple Choice

Which mineral among Fluorite, Apatite, and Feldspar has the highest Mohs hardness?

Explanation:
Mohs hardness measures how easily a mineral can be scratched, i.e., its resistance to scratching. Fluorite sits at about 4, Apatite at about 5, and Feldspar at about 6. Since 6 is higher than 4 and 5, Feldspar is the hardest among the three. (For context, Quartz is harder still at 7, but it isn’t one of the minerals in the comparison.)

Mohs hardness measures how easily a mineral can be scratched, i.e., its resistance to scratching. Fluorite sits at about 4, Apatite at about 5, and Feldspar at about 6. Since 6 is higher than 4 and 5, Feldspar is the hardest among the three. (For context, Quartz is harder still at 7, but it isn’t one of the minerals in the comparison.)

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