Biology, 09.11.2020 16:40, Kemby12

3. Measure: Select the Hardness test. Hardness is a measure of how easily a mineral can be scratched. It is measured on a scale of 1 to 10 called Mohs scale. If a mineral scratches a fingernail (hardness 2.5) but not a penny (3.5), its hardness is about 3.

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3. Measure: Select the Hardness test. Hardness is a measure of how easily a mineral can be scratched...

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