What is the Mohs hardness for Apatite?

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What is the Mohs hardness for Apatite?

Mohs hardness measures scratch resistance: a mineral can scratch anything with a lower number and can be scratched by anything with a higher number. Apatite sits in the middle of the scale, harder than calcite but not as hard as feldspar, and it is assigned a hardness of five. This means it can scratch softer minerals and be scratched by harder ones. In practice, this mid-range placement helps distinguish it from neighbors on the scale. So the value that describes apatite’s hardness is five.

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