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Mohs hardness scale

Mohs Hardness Scale

Mohs Hardness Scale

Say you're out rock hunting and you find a clear crystal. Any chance it's a gemstone? Try to scratch it with a paperclip. If it's calcite, like what's shown here, you'll make a scratch — and rule out quartz.

A mineral's hardness (resistance to scratching) is a key indicator of the kind of mineral it is. Take a closer look at Mohs Hardness Test.

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