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