Magnetite's hardness is rated at 5.5 - 6.5, while diamond's hardness is rated at 10 on the Mohs scale -- 10 being the hardest.
So, no.
No, diamond is harder than enamel.
Yes, harder than any metal.
diamond
nanodiamonds
Diamond is much harder than copper. On the Mohs hardness scale (higher numbers are harder), diamond is a 10 and copper is somewhere between 3 and 4.
magnetite is harder than galena. Magnetite has a hardness just under glass, so around 5. Galena sits at around 4 on mohs hardness scale
No, diamond is harder than enamel.
No. Diamond is harder than emerald.
Diamond is harder than onyx.
Diamond is harder than plastic.
Magnetite
nothings harder than a diamond
Diamond is harder than any metal.
Yes, diamond is harder than granite. Diamond is the hardest mineral known. And it is several times harder than granite.
Diamond is harder than steel: you can scratch steel with a diamond, but steel will not scratch a diamond.
Yes, harder than any metal.
no