Jess scratches an unknown mineral with topaz, which has a Mohs hardness of 8. Topaz leaves a scratch on the unknown mineral. The unknown mineral _____.

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asked Jul 17, 2021 113k views

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Teflon Ted · Answer 1 · 2021-07-22T12:57:50+0000

The unknown mineral has to have a smaller hardness number (meaning it’s softer). It’s hardness can be between 1-7. Some minerals it could be (and their hardness) are:
quartz-7
orthoclase-6
apatite-5
fluorite-4
calcite-3
gypsum-2
talc-1

Jess scratches an unknown mineral with topaz, which has a Mohs hardness of 8. Topaz leaves a scratch on the unknown mineral. The unknown mineral _____.

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