Mohs Hardness Scale

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Musovite is scratched by your fingernail. What is the hardness?

less than 2.5

Zircon scratches a fingernail, a penny, glass, and the steel nail. What is it's hardness?

more than 6.5

Hornblende scratches a fingernail, a penny, glass, but not a steel nail. What is the hardness?

5.5 to 6.5

Dolomite scratches a fingernail, a penny, but not glass, What is the hardness?

3.5 to 5.5

Silver scratches a fingernail, but does not scratch a penny. What is the hardness?

2.5 to 3.5

Hardness (Definition)

A measure of how easily a mineral can be scratched


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