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Corundum- which can only be scratched by diamond. Diamond cannot be scratched by any other mineral.
Talc is the softest mineral and can be scratched by any other mineral.
A diamond. Actually, a diamond can be scratched my other minerals.
potassium feldspar
Diamond are only scratched by diamonds.
Magnatite is the mineral that has a nonmatallic luster, is black, and can be scratched by a fingernail.
Diamond are only scratched by diamonds.
nickel
Talc is one such mineral and as such is a reference mineral in the Mohs Hardness Scale.
The mineral with hardness 3 will get scratched.
hardness
A topaz