Tourmaline
Corundum
Diamond
no
That depends what you scratch it with, what material the rock is made from, and how much force you apply when scratching.
TourmalineCorundumDiamond
If two rocks cannot scratch each other, then they would have to be of equal hardness. A harder rock can always scratch a softer rock.
When you scratch a rock on something, it’s often referred to as testing the rock's hardness or conducting a scratch test. This is commonly done to identify minerals using the Mohs scale of mineral hardness, which ranks minerals based on their ability to scratch one another. The process can help determine the composition and characteristics of the rock or mineral being tested.
it can get scratch by a diamond
That would be Talc.
diamond
will 0000 rock wool scratch windsheild glass
you can crush it good or you can scratch it on something hard
Your nail is 2.5 so the rocks you can scratch are, Gypsum and Talc.
Diamond will scratch all rocks and other minerals, including itself.