A mineral's resistance to being scratched (or when a force is applied) is called its hardness.
There are different measurements of hardness: scratch hardness, indentation hardness, and rebound hardness. A material's hardness depends on ductility, elastic stiffness, plasticity, strain, strength, toughness, viscoelasticity, and viscosity.
Hardness
It depends on how soft the mineral is. For example, Talc is the softest mineral. You can scratch it with just a fingernail. but on the other hand, Diamond, the hardest mineral can only be scratched with another Diamond. So as long as you are not trying to scratch a diamond (it would be 50/ 50 change of scratching if use another diamond), use a diamond. NOTE: how easy it is to scratch a mineral has nothing to do with how easy it is to break a mineral. Example diamond is the hardest mineral but can be chipped or broken by a good strong hammer stroke.
Is called a mineral
The term used to describe ' how a mineral reflect light from its surface ' is Lustre .
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Vasodilators
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The term 'Fibonacci retracement' refers to a method of technical analysis for studying the support and resistance level. This term was developed after they used the Fibonacci sequence.
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