That would be Talc.
Your nail is 2.5 so the rocks you can scratch are, Gypsum and Talc.
Yes: not a good use for a diamond, but yes, a diamond will scratch a nail.
i think so
i think so
no it doesn't transmit disease unless if there is some virus in nail
A nail scratch on the face usually takes about 1-2 weeks to heal and disappear completely.
Nail polish remover... or scratch it off... It does eventually fall off.
Paint it over a new nail polish and wipe it right away
No. Only another diamond can scratch a diamond.
Yes, nickel is softer than steel, so it is possible for a nail to scratch nickel.
A steel nail cannot scratch minerals that are harder than itself, which has a Mohs hardness of about 4.5. This means it cannot scratch minerals such as quartz (hardness 7), topaz (hardness 8), corundum (hardness 9), and diamond (hardness 10). These minerals possess greater hardness and will resist scratching by a steel nail.
TourmalineCorundumDiamond